diff --git a/src/mzscheme/src/file.c b/src/mzscheme/src/file.c
index 5b567528d8..55bdfa0f2d 100644
--- a/src/mzscheme/src/file.c
+++ b/src/mzscheme/src/file.c
@@ -2302,7 +2302,7 @@ static Scheme_Object *do_path_to_directory_path(char *s, long offset, long len,
   if (just_check)
     return NULL;
 
-  s2 = (char *)scheme_malloc_atomic(len + 1);
+  s2 = (char *)scheme_malloc_atomic(len + 2);
   memcpy(s2, s XFORM_OK_PLUS offset, len);
   s2[len] = FN_SEP;
   s2[len+1] = 0;
diff --git a/src/mzscheme/src/jit.c b/src/mzscheme/src/jit.c
index 65ce8a9d8d..af8ddbdf14 100644
--- a/src/mzscheme/src/jit.c
+++ b/src/mzscheme/src/jit.c
@@ -3565,7 +3565,7 @@ static int generate_case_closure(Scheme_Object *obj, mz_jit_state *jitter)
     if (SCHEME_PROCP(o))
       o = (Scheme_Object *)((Scheme_Closure *)o)->code;
     data = (Scheme_Closure_Data *)o;
-    mz_pushr_p(JIT_R1); /* !!!!!!! */  
+    mz_pushr_p(JIT_R1);
     generate_closure(data, jitter);
     CHECK_LIMIT();
     generate_closure_fill(data, jitter);
@@ -3792,7 +3792,7 @@ static int generate(Scheme_Object *obj, mz_jit_state *jitter, int is_tail, int m
 	  jit_movr_p(JIT_V1, JIT_R0);
 	  mz_pushr_p(JIT_V1);
 	  mz_pushr_p(JIT_V1);
-	  mz_pushr_p(JIT_V1); /* !!!!!!!! */
+	  mz_pushr_p(JIT_V1);
 	  __START_SHORT_JUMPS__(1);
 	  ref = jit_bnei_p(jit_forward(), JIT_R0, SCHEME_MULTIPLE_VALUES);
 	  CHECK_LIMIT();
@@ -3807,7 +3807,7 @@ static int generate(Scheme_Object *obj, mz_jit_state *jitter, int is_tail, int m
 	  jit_ori_l(JIT_V1, JIT_V1, 0x1);
 	  mz_pushr_p(JIT_V1);
 	  jit_ldxi_p(JIT_V1, JIT_R0, &((Scheme_Thread *)0x0)->ku.multiple.array);
-	  mz_pushr_p(JIT_V1); /* !!!!!!!! */
+	  mz_pushr_p(JIT_V1);
 	  CHECK_LIMIT();
 	  (void)jit_movi_p(JIT_R1, 0x0);
 	  mz_pushr_p(JIT_R1); /* pushing 0 indicates that multi-array follows */
@@ -4533,7 +4533,7 @@ static int generate(Scheme_Object *obj, mz_jit_state *jitter, int is_tail, int m
 	generate_non_tail(wcm->val, jitter, 0, 1);
 	CHECK_LIMIT();
       } else {
-	mz_pushr_p(JIT_R0); /* !!!!!!! */
+	mz_pushr_p(JIT_R0);
 	generate_non_tail(wcm->val, jitter, 0, 1);
 	CHECK_LIMIT();
 	mz_popr_p(JIT_V1);