diff --git a/code/unix/setup/ioquake3.sh b/code/unix/setup/ioquake3.sh
index 39c651ca..0fd12950 100644
--- a/code/unix/setup/ioquake3.sh
+++ b/code/unix/setup/ioquake3.sh
@@ -36,9 +36,15 @@ else
 fi
 export LD_LIBRARY_PATH
 
-arch=`uname -m`
-case "$arch" in
-	i?86) arch=i386 ;;
+archs=`uname -m`
+case "$archs" in
+	i?86) archs=i386 ;;
+	x86_64) archs="x86_64 i386" ;;
+	ppc64) archs="ppc64 ppc" ;;
 esac
 
-exec ./ioquake3.$arch "$@"
+for arch in $archs; do
+	test -x ./ioquake3.$arch || continue
+	exec ./ioquake3.$arch "$@"
+done
+echo "could not execute ioquake3" >&2