diff --git a/libcfs/include/libcfs/linux/libcfs.h b/libcfs/include/libcfs/linux/libcfs.h
index 8d1d2e12f5428abf85ad8d2b3b6dffb74af39f01..ae960e8fedd72a1413a1a1cb13d7c968c7ae4cbd 100644
--- a/libcfs/include/libcfs/linux/libcfs.h
+++ b/libcfs/include/libcfs/linux/libcfs.h
@@ -151,7 +151,7 @@ struct ptldebug_header {
 
 #define __CHECK_STACK(file, func, line)                                 \
 do {                                                                    \
-        unsigned int _stack = CDEBUG_STACK();                           \
+        unsigned long _stack = CDEBUG_STACK();                           \
                                                                         \
         if (_stack > 3*THREAD_SIZE/4 && _stack > libcfs_stack) {        \
                 libcfs_stack = _stack;                                  \