diff --git a/src/plugins/vcsbase/CMakeLists.txt b/src/plugins/vcsbase/CMakeLists.txt
index 82aa07eba91..c26bf04ef21 100644
--- a/src/plugins/vcsbase/CMakeLists.txt
+++ b/src/plugins/vcsbase/CMakeLists.txt
@@ -35,5 +35,5 @@ add_qtc_plugin(VcsBase
 
 extend_qtc_plugin(VcsBase
   CONDITION WITH_TESTS
-  DEFINES SRC_DIR="${IDE_SOURCE_TREE}"
+  DEFINES SRC_DIR="${PROJECT_SOURCE_DIR}"
 )
diff --git a/src/plugins/vcsbase/vcsbase.qbs b/src/plugins/vcsbase/vcsbase.qbs
index 23710f40e67..ac629c450d8 100644
--- a/src/plugins/vcsbase/vcsbase.qbs
+++ b/src/plugins/vcsbase/vcsbase.qbs
@@ -80,5 +80,5 @@ QtcPlugin {
         "wizard/vcsjsextension.h",
     ]
 
-    cpp.defines: base.concat(qtc.testsEnabled ? ['SRC_DIR="' + qtc.ide_source_tree + '"'] : [])
+    cpp.defines: base.concat(qtc.testsEnabled ? ['SRC_DIR="' + project.ide_source_tree + '"'] : [])
 }