diff --git a/gio/Makefile.am b/gio/Makefile.am
index 22d4fc197..df318ba7f 100644
--- a/gio/Makefile.am
+++ b/gio/Makefile.am
@@ -349,7 +349,7 @@ win32_more_sources_for_vcproj = \
 
 if OS_WIN32
 appinfo_sources += gwin32appinfo.c gwin32appinfo.h
-contenttype_sources += contenttype-win32.c
+contenttype_sources += gcontenttype-win32.c
 platform_libadd += -lshlwapi -lws2_32 -ldnsapi -liphlpapi
 win32_sources = $(win32_actual_sources)