diff --git a/clientgui/Makefile.am b/clientgui/Makefile.am
index e61e29c90e..95d53fe6dc 100644
--- a/clientgui/Makefile.am
+++ b/clientgui/Makefile.am
@@ -67,7 +67,7 @@ boincmgr_SOURCES = \
     DlgItemProperties.cpp \
     DlgOptions.cpp \
     DlgSelectComputer.cpp \
-    gtk\taskbarex.cpp \
+    gtk/taskbarex.cpp \
     LogBOINC.cpp \
     MainDocument.cpp \
     NoInternetConnectionPage.cpp \