diff --git a/src/plugins/nim/project/nimblebuildconfiguration.h b/src/plugins/nim/project/nimblebuildconfiguration.h
index 3d52af523e8..e3a170294e0 100644
--- a/src/plugins/nim/project/nimblebuildconfiguration.h
+++ b/src/plugins/nim/project/nimblebuildconfiguration.h
@@ -47,7 +47,7 @@ class NimbleBuildConfiguration : public ProjectExplorer::BuildConfiguration
 private:
     void setBuildType(BuildType buildType);
 
-    BuildType m_buildType;
+    BuildType m_buildType = ProjectExplorer::BuildConfiguration::Unknown;
 };
 
 class NimbleBuildConfigurationFactory final : public ProjectExplorer::BuildConfigurationFactory