diff --git a/app/core/Makefile.am b/app/core/Makefile.am
index 242678a8d2..036798af0e 100644
--- a/app/core/Makefile.am
+++ b/app/core/Makefile.am
@@ -148,7 +148,6 @@ libappcore_a_sources = \
 	gimpdrawable-posterize.h		\
 	gimpdrawable-preview.c			\
 	gimpdrawable-preview.h			\
-	gimpdrawable-private.c			\
 	gimpdrawable-private.h			\
 	gimpdrawable-process.c			\
 	gimpdrawable-process.h			\