diff --git a/racket/src/racket/src/jitinline.c b/racket/src/racket/src/jitinline.c
index f42b64583a..0b3fb79efd 100644
--- a/racket/src/racket/src/jitinline.c
+++ b/racket/src/racket/src/jitinline.c
@@ -2777,11 +2777,17 @@ int scheme_generate_inlined_binary(mz_jit_state *jitter, Scheme_App3_Rec *app, i
       ref_fx1 = jit_bmsi_ul(jit_forward(), JIT_R0, 0x1);
       jit_ldxi_s(JIT_R2, JIT_R0, &((Scheme_Object *)0x0)->type);
       ref_fail1 = jit_bnei_i(jit_forward(), JIT_R2, string_type);
+    } else {
+      ref_fx1 = NULL;
+      ref_fail1 = NULL;
     }
     if (!is_str2) {
       ref_fx2 = jit_bmsi_ul(jit_forward(), JIT_R1, 0x1);
       jit_ldxi_s(JIT_V1, JIT_R1, &((Scheme_Object *)0x0)->type);
       ref_fail2 = jit_bnei_i(jit_forward(), JIT_V1, string_type);
+    } else {
+      ref_fx2 = NULL;
+      ref_fail2 = NULL;
     }
     ref_ucnofail = jit_jmpi(jit_forward());
     CHECK_LIMIT();
diff --git a/racket/src/racket/src/optimize.c b/racket/src/racket/src/optimize.c
index c84dfff54e..953a0c7fe8 100644
--- a/racket/src/racket/src/optimize.c
+++ b/racket/src/racket/src/optimize.c
@@ -5795,8 +5795,8 @@ scheme_optimize_lets(Scheme_Object *form, Optimize_Info *info, int for_inline, i
   int did_set_value, checked_once, skip_depth, unused_clauses, found_escapes;
   int remove_last_one = 0, inline_fuel, rev_bind_order;
   int post_bind = !(SCHEME_LET_FLAGS(head) & (SCHEME_LET_RECURSIVE | SCHEME_LET_STAR));
-  int pre_vclock, pre_aclock, pre_kclock, pre_sclock, increments_kclock;
-  int once_vclock, once_aclock, once_kclock, once_sclock, once_increments_kclock;
+  int pre_vclock, pre_aclock, pre_kclock, pre_sclock, increments_kclock = 0;
+  int once_vclock, once_aclock, once_kclock, once_sclock, once_increments_kclock = 0;
 
 # define pos_EARLIER(a, b) (rev_bind_order ? ((a) > (b)) : ((a) < (b)))