diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 9537959c18..ab46644c24 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -1024,7 +1024,7 @@ endif
 dist-hook: ../build/win32/vs9/gtk.vcproj ../build/win32/vs10/gtk.vcxproj ../build/win32/vs10/gtk.vcxproj.filters
 
 ../build/win32/vs9/gtk.vcproj: ../build/win32/vs9/gtk.vcprojin
-	for F in $(gtk_base_c_sources) $(gtk_os_win32_c_sources) $(gtk_use_win32_c_sources); do \
+	for F in `echo $(gtk_base_c_sources) $(gtk_os_win32_c_sources) $(gtk_use_win32_c_sources) | tr '/' '\\'`; do \
 		case $$F in \
 		*.c) echo '   <File RelativePath="..\..\..\gtk\'$$F'" />' \
 		     ;; \
@@ -1034,7 +1034,7 @@ dist-hook: ../build/win32/vs9/gtk.vcproj ../build/win32/vs10/gtk.vcxproj ../buil
 	rm libgtk.sourcefiles
 
 ../build/win32/vs10/gtk.vcxproj: ../build/win32/vs10/gtk.vcxprojin
-	for F in $(gtk_base_c_sources) $(gtk_os_win32_c_sources) $(gtk_use_win32_c_sources); do \
+	for F in `echo $(gtk_base_c_sources) $(gtk_os_win32_c_sources) $(gtk_use_win32_c_sources) | tr '/' '\\'`; do \
 		case $$F in \
 		*.c) echo '   <ClCompile Include="..\..\..\gtk\'$$F'" />' \
 		     ;; \
@@ -1044,7 +1044,7 @@ dist-hook: ../build/win32/vs9/gtk.vcproj ../build/win32/vs10/gtk.vcxproj ../buil
 	rm libgtk.vs10.sourcefiles
 
 ../build/win32/vs10/gtk.vcxproj.filters: ../build/win32/vs10/gtk.vcxproj.filtersin
-	for F in $(gtk_base_c_sources) $(gtk_os_win32_c_sources) $(gtk_use_win32_c_sources); do \
+	for F in `echo $(gtk_base_c_sources) $(gtk_os_win32_c_sources) $(gtk_use_win32_c_sources) | tr '/' '\\'`; do \
 		case $$F in \
 		*.c) echo '   <ClCompile Include="..\..\..\gtk\'$$F'"><Filter>Source Files</Filter></ClCompile>' \
 		     ;; \