diff --git a/ctest/Makefile b/ctest/Makefile
index ca05a6961..7fe273f0e 100644
--- a/ctest/Makefile
+++ b/ctest/Makefile
@@ -25,7 +25,9 @@ endif
 
 override CFLAGS += -DADD$(BU) -DCBLAS
 ifeq ($(F_COMPILER),GFORTRAN)
+ifeeq (, $(filter $(CORE),LOONGSON3R3 LOONGSON3R4))
 	override FFLAGS = $(filter_out(-O2 -O3,$(FFLAGS)) -O0
+endif
 	override FFLAGS += -fno-tree-vectorize
 endif
 override TARGET_ARCH=