diff --git a/configure b/configure
index f47432c2d8..adebac0559 100755
--- a/configure
+++ b/configure
@@ -1173,10 +1173,12 @@ EOF
     ;;
     "Power Macintosh"|ppc|powerpc)
         arch="powerpc"
+        enable fast_unaligned
     ;;
     ppc64)
         arch="powerpc"
         enable fast_64bit
+        enable fast_unaligned
     ;;
     mips|mipsel|IP*)
         arch="mips"