diff --git a/sds.c b/sds.c
index c0388bd..b774732 100644
--- a/sds.c
+++ b/sds.c
@@ -197,7 +197,7 @@ void sdsclear(sds s) {
 sds sdsMakeRoomFor(sds s, size_t addlen) {
     void *sh, *newsh;
     size_t avail = sdsavail(s);
-    size_t len, newlen, reqlen;
+    size_t len, newlen, required_len;
     char type, oldtype = s[-1] & SDS_TYPE_MASK;
     int hdrlen;
 
@@ -206,7 +206,7 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
 
     len = sdslen(s);
     sh = (char*)s-sdsHdrSize(oldtype);
-    reqlen = newlen = (len+addlen);
+    required_len = newlen = (len+addlen);
     if (newlen <= len) return NULL; /* Catch size_t overflow */
     if (newlen < SDS_MAX_PREALLOC)
         newlen *= 2;
@@ -221,7 +221,7 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
     if (type == SDS_TYPE_5) type = SDS_TYPE_8;
 
     hdrlen = sdsHdrSize(type);
-    if (hdrlen+newlen+1 <= reqlen) return NULL; /* Catch size_t overflow */
+    if (hdrlen+newlen+1 <= required_len) return NULL; /* Catch size_t overflow */
     if (oldtype==type) {
         newsh = s_realloc(sh, hdrlen+newlen+1);
         if (newsh == NULL) return NULL;