diff --git a/build/autoconf/compiler-opts.m4 b/build/autoconf/compiler-opts.m4
index 0848d78d9c..77c2e85b5e 100644
--- a/build/autoconf/compiler-opts.m4
+++ b/build/autoconf/compiler-opts.m4
@@ -179,7 +179,7 @@ if test "$GNU_CC"; then
     CFLAGS="$CFLAGS -fno-math-errno"
     CXXFLAGS="$CXXFLAGS -fno-exceptions -fno-math-errno"
 
-    if test "$CPU_ARCH" = x86; then
+    if test "$CPU_ARCH" = "x86" -o "$CPU_ARCH" = "x86_64"; then
       CFLAGS="$CFLAGS -msse2 -mfpmath=sse"
       CXXFLAGS="$CXXFLAGS -msse2 -mfpmath=sse"
     fi