diff --git a/src/gallium/state_trackers/wgl/Makefile.sources b/src/gallium/state_trackers/wgl/Makefile.sources
index 8c463d5f18e..1e00caf97b7 100644
--- a/src/gallium/state_trackers/wgl/Makefile.sources
+++ b/src/gallium/state_trackers/wgl/Makefile.sources
@@ -9,6 +9,7 @@ C_SOURCES := \
 	stw_framebuffer.c \
 	stw_getprocaddress.c \
 	stw_nopfuncs.c \
+	stw_nopfuncs.h \
 	stw_pixelformat.c \
 	stw_st.c \
 	stw_tls.c \