diff --git a/m4/ax_linuxkm.m4 b/m4/ax_linuxkm.m4
index f9c8be7a8..5bfa362ee 100644
--- a/m4/ax_linuxkm.m4
+++ b/m4/ax_linuxkm.m4
@@ -77,6 +77,7 @@ AC_DEFUN([AX_SIMD_CC_COMPILER_FLAGS], [
         AX_APPEND_COMPILE_FLAGS([-msse],[CFLAGS_SIMD_ENABLE])
         AX_APPEND_COMPILE_FLAGS([-mmmx],[CFLAGS_SIMD_ENABLE])
         AX_APPEND_COMPILE_FLAGS([-msse2],[CFLAGS_SIMD_ENABLE])
+        AX_APPEND_COMPILE_FLAGS([-msse4],[CFLAGS_SIMD_ENABLE])
         AX_APPEND_COMPILE_FLAGS([-mavx],[CFLAGS_SIMD_ENABLE])
         AX_APPEND_COMPILE_FLAGS([-mavx2],[CFLAGS_SIMD_ENABLE])
         AX_APPEND_COMPILE_FLAGS([-mno-general-regs-only],[CFLAGS_SIMD_ENABLE])