diff --git a/src/runtime/mbitmap.go b/src/runtime/mbitmap.go
index 294e3739b7..afaec55569 100644
--- a/src/runtime/mbitmap.go
+++ b/src/runtime/mbitmap.go
@@ -170,7 +170,7 @@ func (s *mspan) allocBitsForIndex(allocBitIndex uintptr) markBits {
 	return markBits{bytep, mask, allocBitIndex}
 }
 
-// refillaCache takes 8 bytes s.allocBits starting at whichByte
+// refillAllocCache takes 8 bytes s.allocBits starting at whichByte
 // and negates them so that ctz (count trailing zeros) instructions
 // can be used. It then places these 8 bytes into the cached 64 bit
 // s.allocCache.