diff --git a/plugins/molfile_plugin/Makefile b/plugins/molfile_plugin/Makefile
index 18fb6dc..8659573 100644
--- a/plugins/molfile_plugin/Makefile
+++ b/plugins/molfile_plugin/Makefile
@@ -14,8 +14,8 @@ INCDIR = -I../include -I${SRCDIR}
 
 VPATH = src ../include ${ARCHDIR}
 
-SCCFLAGS = $(CCFLAGS) $(DEF)"STATIC_PLUGIN"
-SCXXFLAGS = $(CCFLAGS) $(DEF)"STATIC_PLUGIN"
+SCCFLAGS = $(CFLAGS) $(DEF)"STATIC_PLUGIN"
+SCXXFLAGS = $(CXXFLAGS) $(DEF)"STATIC_PLUGIN"
 
 #
 # Rules
diff --git a/plugins/molfile_plugin/src/cifplugin/Makefile b/plugins/molfile_plugin/src/cifplugin/Makefile
index 1dfa768..9de3f6b 100644
--- a/plugins/molfile_plugin/src/cifplugin/Makefile
+++ b/plugins/molfile_plugin/src/cifplugin/Makefile
@@ -14,7 +14,7 @@ INCDIR = -I../include -I${SRCDIR}
 VPATH = src ../include ${ARCHDIR}
 
 SCCFLAGS = $(CCFLAGS) $(DEF)"STATIC_PLUGIN"
-SCXXFLAGS = $(CCFLAGS) $(DEF)"STATIC_PLUGIN"
+SCXXFLAGS = $(CXXFLAGS) $(DEF)"STATIC_PLUGIN"
 
 #
 # Rules