diff --git a/src/racket/src/jit.c b/src/racket/src/jit.c
index e079ddfd78..bd694425fd 100644
--- a/src/racket/src/jit.c
+++ b/src/racket/src/jit.c
@@ -1426,6 +1426,7 @@ static int generate_non_tail_with_branch(Scheme_Object *obj, mz_jit_state *jitte
       LOG_IT(("non-tail\n"));
       if (mark_pos_ends)
 	scheme_generate_non_tail_mark_pos_prefix(jitter);
+      CHECK_LIMIT();
       if (!jitter->local1_busy) {
         mz_tl_ldi_p(JIT_R2, tl_scheme_current_cont_mark_stack);
         using_local1 = 1;
diff --git a/src/racket/src/jit.h b/src/racket/src/jit.h
index 49fd376246..9ff671c0cc 100644
--- a/src/racket/src/jit.h
+++ b/src/racket/src/jit.h
@@ -1154,7 +1154,7 @@ static void emit_indentation(mz_jit_state *jitter)
 /*                             jitstate                               */
 /**********************************************************************/
 
-#ifdef SIXTY_FOUR_BIT_INTEGERS
+#if defined(SIXTY_FOUR_BIT_INTEGERS) || defined(MZ_USE_JIT_PPC)
 # define JIT_BUFFER_PAD_SIZE 200
 #else
 # define JIT_BUFFER_PAD_SIZE 100