diff --git a/C/grow.c b/C/grow.c
index 0d405b713..91ef8afcf 100755
--- a/C/grow.c
+++ b/C/grow.c
@@ -1825,7 +1825,7 @@ int
 Yap_locked_growtrail(long size, int contiguous_only)
 { 
   CACHE_REGS
-    return do_growtrail(size, contiguous_only, FALSE, NULL, NULL, NULL PASS_REGS);
+  return do_growtrail(size, contiguous_only, FALSE, NULL, NULL, NULL PASS_REGS);
 }
 
 int
diff --git a/C/heapgc.c b/C/heapgc.c
index 7eac9e03f..22ecb3b87 100755
--- a/C/heapgc.c
+++ b/C/heapgc.c
@@ -3992,7 +3992,7 @@ do_gc(Int predarity, CELL *current_env, yamop *nextop USES_REGS)
 #if !USE_SYSTEM_MALLOC
   if (HeapTop >= LOCAL_GlobalBase - MinHeapGap) {
     *--ASP = (CELL)current_env;
-    if (!Yap_growheap(FALSE, MinHeapGap, NULL)) {
+    if (!Yap_locked_growheap(FALSE, MinHeapGap, NULL)) {
       Yap_Error(OUT_OF_HEAP_ERROR, TermNil, LOCAL_ErrorMessage);
       return -1;
     }
@@ -4014,7 +4014,7 @@ do_gc(Int predarity, CELL *current_env, yamop *nextop USES_REGS)
   
     *--ASP = (CELL)current_env;
     if (
-	!Yap_growtrail(sz, FALSE)
+	!Yap_locked_growtrail(sz, FALSE)
 	) {
       Yap_Error(OUT_OF_TRAIL_ERROR,TermNil,"out of %lB during gc", sz);
       return -1;