diff --git a/src/shared/proparser/qmakeevaluator.cpp b/src/shared/proparser/qmakeevaluator.cpp
index 43dcea54349..8b27435ea85 100644
--- a/src/shared/proparser/qmakeevaluator.cpp
+++ b/src/shared/proparser/qmakeevaluator.cpp
@@ -55,7 +55,7 @@
 #include <unistd.h>
 #include <sys/utsname.h>
 #else
-#include <Windows.h>
+#include <windows.h>
 #endif
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/src/shared/proparser/qmakeglobals.cpp b/src/shared/proparser/qmakeglobals.cpp
index 0c112870cde..dac88eeada1 100644
--- a/src/shared/proparser/qmakeglobals.cpp
+++ b/src/shared/proparser/qmakeglobals.cpp
@@ -54,7 +54,7 @@
 #include <unistd.h>
 #include <sys/utsname.h>
 #else
-#include <Windows.h>
+#include <windows.h>
 #endif
 #include <stdio.h>
 #include <stdlib.h>