diff --git a/src/makefile.unix b/src/makefile.unix
index 8110235..91ae3a9 100644
--- a/src/makefile.unix
+++ b/src/makefile.unix
@@ -157,7 +157,7 @@ LIBS += $(CURDIR)/leveldb/libleveldb.a $(CURDIR)/leveldb/libmemenv.a
 DEFS += $(addprefix -I,$(CURDIR)/leveldb/include)
 DEFS += $(addprefix -I,$(CURDIR)/leveldb/helpers)
 leveldb/libleveldb.a:
-	@echo "Building LevelDB ..." && cd leveldb && $(MAKE) CC=$(CC) CXX=$(CXX) OPT="$(xCXXFLAGS)" libleveldb.a libmemenv.a && cd ..
+	@echo "Building LevelDB ..." && cd leveldb && $(MAKE) CC="$(CC)" CXX="$(CXX)" OPT="$(xCXXFLAGS)" libleveldb.a libmemenv.a && cd ..
 
 # auto-generated dependencies:
 -include obj/*.P