diff --git a/src/Makefile.am b/src/Makefile.am
index ea2c29407..f2a6f1df2 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -10,7 +10,7 @@ HBSOURCES =  \
 	hb-blob.c \
 	hb-buffer.c \
 	hb-buffer-private.h \
-	hb-font.c \
+	hb-font.cc \
 	hb-font-private.h \
 	hb-private.h \
 	hb-open-file-private.hh \
diff --git a/src/hb-font.c b/src/hb-font.cc
similarity index 100%
rename from src/hb-font.c
rename to src/hb-font.cc