diff --git a/ctest/Makefile b/ctest/Makefile
index 15c83a907..c5e1094da 100644
--- a/ctest/Makefile
+++ b/ctest/Makefile
@@ -6,6 +6,9 @@ TOPDIR = ..
 include $(TOPDIR)/Makefile.system
 
 override CFLAGS += -DADD$(BU) -DCBLAS
+ifeq ($(F_COMPILER),GFORTRAN)
+	override FFLAGS += -fno-tree-vectorize
+endif
 override TARGET_ARCH=
 override TARGET_MACH=