diff --git a/Makefile b/Makefile
index c1d943fac..7a03b08f0 100644
--- a/Makefile
+++ b/Makefile
@@ -141,7 +141,7 @@ ifndef NO_FBLAS
 	$(MAKE) -C test all
 endif
 	$(MAKE) -C utest all
-ifndef NO_CBLAS
+ifneq ($(NO_CBLAS), 1)
 	$(MAKE) -C ctest all
 ifeq ($(CPP_THREAD_SAFETY_TEST), 1)
 	$(MAKE) -C cpp_thread_test all
@@ -244,7 +244,7 @@ ifeq ($(NOFORTRAN), $(filter 0,$(NOFORTRAN)))
 	@$(MAKE) -C $(NETLIB_LAPACK_DIR) lapacklib
 	@$(MAKE) -C $(NETLIB_LAPACK_DIR) tmglib
 endif
-ifndef NO_LAPACKE
+ifneq ($(NO_LAPACKE), 1)
 	@$(MAKE) -C $(NETLIB_LAPACK_DIR) lapackelib
 endif
 endif
diff --git a/interface/Makefile b/interface/Makefile
index 44a9fdcf0..2dbd60073 100644
--- a/interface/Makefile
+++ b/interface/Makefile
@@ -367,7 +367,7 @@ CZBLAS3OBJS   +=  cblas_zgemm3m.$(SUFFIX)
 endif
 
 
-ifndef NO_CBLAS
+ifneq ($(NO_CBLAS), 1)
 
 override CFLAGS += -I.