diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.cpp b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
index c2e4cdce080..445e9b1ab3b 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
@@ -117,7 +117,7 @@ ProjectExplorer::DeploymentKnowledge CMakeProject::deploymentKnowledge() const
 }
 
 MakeInstallCommand CMakeProject::makeInstallCommand(const Target *target,
-                                                    const QString &installRoot)
+                                                    const FilePath &installRoot)
 {
     MakeInstallCommand cmd;
     if (const BuildConfiguration * const bc = target->activeBuildConfiguration()) {
@@ -131,12 +131,12 @@ MakeInstallCommand CMakeProject::makeInstallCommand(const Target *target,
     QStringList config;
 
     auto bs = qobject_cast<CMakeBuildSystem*>(target->buildSystem());
-    if (bs) {
-        if (bs->usesAllCapsTargets())
-            installTarget = "INSTALL";
-        if (bs->isMultiConfigReader())
-            config << "--config" << bs->cmakeBuildType();
-    }
+    QTC_ASSERT(bs, return {});
+
+    if (bs->usesAllCapsTargets())
+        installTarget = "INSTALL";
+    if (bs->isMultiConfigReader())
+        config << "--config" << bs->cmakeBuildType();
 
     FilePath buildDirectory = ".";
     if (auto bc = bs->buildConfiguration())
@@ -148,7 +148,7 @@ MakeInstallCommand CMakeProject::makeInstallCommand(const Target *target,
     cmd.command.addArg(installTarget);
     cmd.command.addArgs(config);
 
-    cmd.environment.set("DESTDIR", QDir::toNativeSeparators(installRoot));
+    cmd.environment.set("DESTDIR", installRoot.nativePath());
     return cmd;
 }
 
diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.h b/src/plugins/cmakeprojectmanager/cmakeproject.h
index ce7d6a13682..a1f1db439d4 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.h
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.h
@@ -55,7 +55,7 @@ protected:
 private:
     ProjectExplorer::DeploymentKnowledge deploymentKnowledge() const override;
     ProjectExplorer::MakeInstallCommand makeInstallCommand(const ProjectExplorer::Target *target,
-                                                           const QString &installRoot) override;
+                                                           const Utils::FilePath &installRoot) final;
 
     mutable Internal::CMakeProjectImporter *m_projectImporter = nullptr;
 
diff --git a/src/plugins/mesonprojectmanager/project/mesonproject.cpp b/src/plugins/mesonprojectmanager/project/mesonproject.cpp
index aefc3f481d8..2406e35755f 100644
--- a/src/plugins/mesonprojectmanager/project/mesonproject.cpp
+++ b/src/plugins/mesonprojectmanager/project/mesonproject.cpp
@@ -25,9 +25,7 @@
 
 #include "mesonproject.h"
 
-#include "mesonbuildsystem.h"
 #include "mesonpluginconstants.h"
-#include "exewrappers/mesontools.h"
 #include "settings/tools/kitaspect/mesontoolkitaspect.h"
 #include "settings/tools/kitaspect/ninjatoolkitaspect.h"
 
@@ -79,8 +77,8 @@ ProjectExplorer::DeploymentKnowledge MesonProject::deploymentKnowledge() const
     return ProjectExplorer::DeploymentKnowledge::Bad;
 }
 
-ProjectExplorer::MakeInstallCommand MesonProject::makeInstallCommand(
-    const ProjectExplorer::Target *target, const QString &installRoot)
+ProjectExplorer::MakeInstallCommand MesonProject::makeInstallCommand(const ProjectExplorer::Target *target,
+                                                                     const Utils::FilePath &installRoot)
 {
     Q_UNUSED(target)
     Q_UNUSED(installRoot)
diff --git a/src/plugins/mesonprojectmanager/project/mesonproject.h b/src/plugins/mesonprojectmanager/project/mesonproject.h
index ca480a4cc2d..e07b82aa56b 100644
--- a/src/plugins/mesonprojectmanager/project/mesonproject.h
+++ b/src/plugins/mesonprojectmanager/project/mesonproject.h
@@ -47,7 +47,7 @@ public:
 private:
     ProjectExplorer::DeploymentKnowledge deploymentKnowledge() const override;
     ProjectExplorer::MakeInstallCommand makeInstallCommand(const ProjectExplorer::Target *target,
-                                                           const QString &installRoot) override;
+                                                           const Utils::FilePath &installRoot) final;
 
     mutable std::unique_ptr<MesonProjectImporter> m_projectImporter;
 };
diff --git a/src/plugins/projectexplorer/project.cpp b/src/plugins/projectexplorer/project.cpp
index 25022df35df..23998359fb4 100644
--- a/src/plugins/projectexplorer/project.cpp
+++ b/src/plugins/projectexplorer/project.cpp
@@ -971,7 +971,7 @@ bool Project::hasMakeInstallEquivalent() const
     return d->m_hasMakeInstallEquivalent;
 }
 
-MakeInstallCommand Project::makeInstallCommand(const Target *target, const QString &installRoot)
+MakeInstallCommand Project::makeInstallCommand(const Target *target, const FilePath &installRoot)
 {
     QTC_ASSERT(hasMakeInstallEquivalent(), return MakeInstallCommand());
     MakeInstallCommand cmd;
@@ -980,7 +980,7 @@ MakeInstallCommand Project::makeInstallCommand(const Target *target, const QStri
             cmd.command.setExecutable(makeStep->makeExecutable());
     }
     cmd.command.addArg("install");
-    cmd.command.addArg("INSTALL_ROOT=" + QDir::toNativeSeparators(installRoot));
+    cmd.command.addArg("INSTALL_ROOT=" + installRoot.nativePath());
     return cmd;
 }
 
diff --git a/src/plugins/projectexplorer/project.h b/src/plugins/projectexplorer/project.h
index 22495aa47a1..36cb94feeb0 100644
--- a/src/plugins/projectexplorer/project.h
+++ b/src/plugins/projectexplorer/project.h
@@ -149,7 +149,8 @@ public:
 
     virtual DeploymentKnowledge deploymentKnowledge() const { return DeploymentKnowledge::Bad; }
     bool hasMakeInstallEquivalent() const;
-    virtual MakeInstallCommand makeInstallCommand(const Target *target, const QString &installRoot);
+    virtual MakeInstallCommand makeInstallCommand(const Target *target,
+                                                  const Utils::FilePath &installRoot);
 
     void setup(const QList<BuildInfo> &infoList);
     Utils::MacroExpander *macroExpander() const;
diff --git a/src/plugins/projectexplorer/target.cpp b/src/plugins/projectexplorer/target.cpp
index ec551e4ee07..76de5d0da66 100644
--- a/src/plugins/projectexplorer/target.cpp
+++ b/src/plugins/projectexplorer/target.cpp
@@ -803,7 +803,7 @@ QVariant Target::additionalData(Utils::Id id) const
     return {};
 }
 
-MakeInstallCommand Target::makeInstallCommand(const QString &installRoot) const
+MakeInstallCommand Target::makeInstallCommand(const FilePath &installRoot) const
 {
     return project()->makeInstallCommand(this, installRoot);
 }
diff --git a/src/plugins/projectexplorer/target.h b/src/plugins/projectexplorer/target.h
index 12cf80d01aa..a5503ff833b 100644
--- a/src/plugins/projectexplorer/target.h
+++ b/src/plugins/projectexplorer/target.h
@@ -114,7 +114,7 @@ public:
     void setNamedSettings(const QString &name, const QVariant &value);
 
     QVariant additionalData(Utils::Id id) const;
-    MakeInstallCommand makeInstallCommand(const QString &installRoot) const;
+    MakeInstallCommand makeInstallCommand(const Utils::FilePath &installRoot) const;
 
     Utils::MacroExpander *macroExpander() const;
 
diff --git a/src/plugins/remotelinux/makeinstallstep.cpp b/src/plugins/remotelinux/makeinstallstep.cpp
index 20d1a59fc09..c61df08f6cc 100644
--- a/src/plugins/remotelinux/makeinstallstep.cpp
+++ b/src/plugins/remotelinux/makeinstallstep.cpp
@@ -118,7 +118,8 @@ MakeInstallStep::MakeInstallStep(BuildStepList *parent, Id id) : MakeStep(parent
 
     QTemporaryDir tmpDir;
     installRootAspect->setFilePath(FilePath::fromString(tmpDir.path()));
-    const MakeInstallCommand cmd = target()->makeInstallCommand(tmpDir.path());
+
+    const MakeInstallCommand cmd = target()->makeInstallCommand(FilePath::fromString(tmpDir.path()));
     QTC_ASSERT(!cmd.command.isEmpty(), return);
     makeAspect->setExecutable(cmd.command.executable());
 }
@@ -167,7 +168,7 @@ bool MakeInstallStep::init()
                                             "last in the list of deploy steps. "
                                             "Consider moving it up.")));
     }
-    const MakeInstallCommand cmd = target()->makeInstallCommand(rootDir.path());
+    const MakeInstallCommand cmd = target()->makeInstallCommand(rootDir);
     if (cmd.environment.isValid()) {
         Environment env = processParameters()->environment();
         for (auto it = cmd.environment.constBegin(); it != cmd.environment.constEnd(); ++it) {
@@ -255,7 +256,7 @@ void MakeInstallStep::updateArgsFromAspect()
     if (customCommandLineAspect()->isChecked())
         return;
 
-    const CommandLine cmd = target()->makeInstallCommand(installRoot().toString()).command;
+    const CommandLine cmd = target()->makeInstallCommand(installRoot()).command;
     setUserArguments(cmd.arguments());
     updateFullCommandLine();
 }