diff --git a/makefiles/Makefile.clang b/makefiles/Makefile.clang
index cefe725..67a0045 100644
--- a/makefiles/Makefile.clang
+++ b/makefiles/Makefile.clang
@@ -4,7 +4,7 @@ CXX=clang++
 # no FC for clang
 FC=
 flags = -O3 -fstrict-aliasing
-vecflags = -fvectorize -fslp-vectorize-aggressive
+vecflags = -fvectorize -fslp-vectorize
 novecflags = -fno-vectorize
 omp_flags=-fopenmp=libomp