diff --git a/src/llama-mmap.cpp b/src/llama-mmap.cpp
index 47497cf953..0641c2d22f 100644
--- a/src/llama-mmap.cpp
+++ b/src/llama-mmap.cpp
@@ -485,7 +485,7 @@ struct llama_mlock::impl {
         if (suggest && getrlimit(RLIMIT_MEMLOCK, &lock_limit)) {
             suggest = false;
         }
-        if (suggest && (lock_limit.rlim_max > lock_limit.rlim_cur + size)) {
+        if (suggest && ((uint64_t)lock_limit.rlim_max > (uint64_t)lock_limit.rlim_cur + size)) {
             suggest = false;
         }
 #endif