diff --git a/desmume/src/gdbstub/Makefile.am b/desmume/src/gdbstub/Makefile.am
index 3777d67f0..e4312cd1a 100644
--- a/desmume/src/gdbstub/Makefile.am
+++ b/desmume/src/gdbstub/Makefile.am
@@ -1,4 +1,4 @@
 include $(top_srcdir)/src/desmume.mk
 
 noinst_LIBRARIES = libgdbstub.a
-libgdbstub_a_SOURCES = gdbstub.c gdbstub_internal.h
+libgdbstub_a_SOURCES = gdbstub.cpp gdbstub_internal.h