diff --git a/core/src-c/memory.c b/core/src-c/memory.c
index 051d058..b689529 100644
--- a/core/src-c/memory.c
+++ b/core/src-c/memory.c
@@ -14,10 +14,12 @@ bool_t rr_mem_overlap(void *block1, usz_t length1, void *block2, usz_t length2)
     }
     usz_t           start1                  = (usz_t) block1;
     usz_t           start2                  = (usz_t) block2;
+    usz_t           end1                    = start1 + length1;
     usz_t           end2                    = start2 + length2;
 
     if(end2 > start1)
     {
+        if(start2 > end1) return FALSE;
         return TRUE;
     }
     return FALSE;