diff --git a/src/cmd/compile/internal/ppc64/galign.go b/src/cmd/compile/internal/ppc64/galign.go
index 6f9d1407d6..20fd8cec54 100644
--- a/src/cmd/compile/internal/ppc64/galign.go
+++ b/src/cmd/compile/internal/ppc64/galign.go
@@ -16,7 +16,7 @@ func Init(arch *ssagen.ArchInfo) {
 		arch.LinkArch = &ppc64.Linkppc64le
 	}
 	arch.REGSP = ppc64.REGSP
-	arch.MAXWIDTH = 1 << 60
+	arch.MAXWIDTH = 1 << 50
 
 	arch.ZeroRange = zerorange
 	arch.Ginsnop = ginsnop