diff --git a/security/coreconf/rules.mk b/security/coreconf/rules.mk
index 595c3594f53e..969911233edb 100644
--- a/security/coreconf/rules.mk
+++ b/security/coreconf/rules.mk
@@ -477,9 +477,13 @@ ifdef STRICT_CPLUSPLUS_SUFFIX
 else
 ifeq ($(OS_ARCH),WINNT)
 	$(CCC) -Fo$@ -c $(CFLAGS) $*.cpp
+else
+ifdef XP_OS2_VACPP
+	$(CCC) -Fo$@ -c $(CFLAGS) $*.cpp
 else
 	$(CCC) -o $@ -c $(CFLAGS) $*.cpp
 endif
+endif
 endif #STRICT_CPLUSPLUS_SUFFIX
 
 %.i: %.cpp