diff --git a/ctest/Makefile b/ctest/Makefile
index 6c7cc1ed56..46885f3bb7 100644
--- a/ctest/Makefile
+++ b/ctest/Makefile
@@ -25,6 +25,9 @@ endif
 
 override CFLAGS += -DADD$(BU) -DCBLAS
 ifeq ($(F_COMPILER),GFORTRAN)
+ifneq (, $(filter $(CORE),LOONGSON3R3 LOONGSON3R4))
+	override FFLAGS = $(filter_out(-O2 -O3,$(FFLAGS)) -O0
+endif
 	override FFLAGS += -fno-tree-vectorize
 endif
 override TARGET_ARCH=
diff --git a/test/Makefile b/test/Makefile
index 6a50b6c983..85bdca1030 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -1,6 +1,9 @@
 TOPDIR	= ..
 include ../Makefile.system
 ifeq ($(F_COMPILER),GFORTRAN)
+ifneq (, $(filter $(CORE),LOONGSON3R3 LOONGSON3R4))
+	override FFLAGS = $(filter_out(-O2 -O3,$(FFLAGS)) -O0
+endif
         override FFLAGS += -fno-tree-vectorize
 endif