diff --git a/ctest/Makefile b/ctest/Makefile
index 7fe273f0e..46885f3bb 100644
--- a/ctest/Makefile
+++ b/ctest/Makefile
@@ -25,7 +25,7 @@ endif
 
 override CFLAGS += -DADD$(BU) -DCBLAS
 ifeq ($(F_COMPILER),GFORTRAN)
-ifeeq (, $(filter $(CORE),LOONGSON3R3 LOONGSON3R4))
+ifneq (, $(filter $(CORE),LOONGSON3R3 LOONGSON3R4))
 	override FFLAGS = $(filter_out(-O2 -O3,$(FFLAGS)) -O0
 endif
 	override FFLAGS += -fno-tree-vectorize