diff --git a/wineopenxr/Makefile.in b/wineopenxr/Makefile.in
index 150a7aad..e2cd8b7a 100644
--- a/wineopenxr/Makefile.in
+++ b/wineopenxr/Makefile.in
@@ -4,6 +4,6 @@ IMPORTS    = advapi32 dxgi
 EXTRADLLFLAGS = -mcygwin -lvulkan
 EXTRADEFS = -DWINE_NO_LONG_TYPES
 
-C_SRCS = \
+SOURCES = \
 	openxr.c \
 	openxr_thunks.c \