diff --git a/gcc/config/mmix/mmix.h b/gcc/config/mmix/mmix.h
index 9317c20e3c8..ac0be100aee 100644
--- a/gcc/config/mmix/mmix.h
+++ b/gcc/config/mmix/mmix.h
@@ -577,6 +577,9 @@ typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
 
 #define SLOW_BYTE_ACCESS 0
 
+/* A PUSHJ doesn't cost more than a PUSHGO, so don't needlessly create
+   the latter.  */
+#define NO_FUNCTION_CSE 1
 
 /* Node: Sections */