diff --git a/libyara/filemap.c b/libyara/filemap.c
index d3d164c036..656a8c0fd6 100644
--- a/libyara/filemap.c
+++ b/libyara/filemap.c
@@ -179,7 +179,7 @@ YR_API int yr_filemap_map_fd(
 
 YR_API int yr_filemap_map_fd(
     YR_FILE_DESCRIPTOR file,
-    off_t offset,
+    int64_t offset,
     size_t size,
     YR_MAPPED_FILE* pmapped_file)
 {
@@ -293,7 +293,7 @@ YR_API int yr_filemap_map_ex(
 
 YR_API int yr_filemap_map_ex(
     const char* file_path,
-    off_t offset,
+    int64_t offset,
     size_t size,
     YR_MAPPED_FILE* pmapped_file)
 {