diff --git a/src/hash.cpp b/src/hash.cpp

index 4216157..e6bfc11 100644

--- a/src/hash.cpp

+++ b/src/hash.cpp

@@ -279,7 +279,7 @@ void file_data_hasher_t::hash()

 		MAP_FILE|

 #endif

 		MAP_SHARED,fd,0);

-	    if(fdht->base>0){		

+	    if(fdht->base!=0){		

 		/* mmap is successful, so set the bounds.

 		 * if it is not successful, we default to reading the fd

 		 */