1 files changed, 1 insertions, 1 deletions
diff --git a/db/tests.cpp b/db/tests.cpp
index 1218f1b..00f299e 100644
--- a/db/tests.cpp
+++ b/db/tests.cpp
@@ -32,7 +32,7 @@ namespace mongo {
 
         MemoryMappedFile f;
 
-        long len = 64*1024*1024;
+        unsigned long long len = 64*1024*1024;
         char *p = (char *) f.map("/tmp/test.dat", len);
         char *start = p;
         char *end = p + 64*1024*1024-2;