diff --git a/lldb/test/API/macosx/lc-note/firmware-corefile/Makefile b/lldb/test/API/macosx/lc-note/firmware-corefile/Makefile
index 05020112520e8..4d798fc9ad993 100644
--- a/lldb/test/API/macosx/lc-note/firmware-corefile/Makefile
+++ b/lldb/test/API/macosx/lc-note/firmware-corefile/Makefile
@@ -6,6 +6,6 @@ all: a.out create-empty-corefile
 
 create-empty-corefile:
 	"$(MAKE)" -f "$(MAKEFILE_RULES)" EXE=create-empty-corefile \
-		C_SOURCES=create-empty-corefile.c
+	    CXX=$(CC) CXX_SOURCES=create-empty-corefile.cpp
 
 include Makefile.rules