diff --git a/configure.ac b/configure.ac
index 712202218bb3f3bddabbdcb8f10f48afb12ab61f..e5d44fda300f15088c282b93b25499ecb242e24f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -235,8 +235,8 @@ if test "$enable_vec" = "no"; then
       CFLAGS="$CFLAGS -fno-tree-vectorize"
       AC_MSG_RESULT([disabled GCC vectorization])
    elif test "$ax_cv_c_compiler_vendor" = "clang"; then
-      CFLAGS="$CFLAGS -fno-vectorize"
-      AC_MSG_RESULT([clang GCC vectorization])
+      CFLAGS="$CFLAGS -fno-vectorize -fno-slp-vectorize"
+      AC_MSG_RESULT([disabled clang vectorization])
    else
       AC_MSG_WARN([Do not know how to disable vectorization for this compiler])
    fi