diff --git a/gpMgmt/bin/Makefile b/gpMgmt/bin/Makefile
index 4571c71a64b526ca56b0b13c6351e8c363e03c0e..d530636711538a83f7a02ee5d02cc65f498be0f6 100644
--- a/gpMgmt/bin/Makefile
+++ b/gpMgmt/bin/Makefile
@@ -148,7 +148,7 @@ pylint:
 
 $(MOCK_BIN):
 	@echo "--- mock for platform $(UBUNTU_PLATFORM)"
-	@if [ $(UBUNTU_PLATFORM) = "Ubuntu" ]; then\
+	@if [ "$(UBUNTU_PLATFORM)" = "Ubuntu" ]; then\
        pip install mock;\
      else\
        mkdir -p $(PYTHONSRC_INSTALL_SITE) && \