diff --git a/reactos/lib/rtl/image.c b/reactos/lib/rtl/image.c
index 6fb56c01310..e7dafc25e25 100644
--- a/reactos/lib/rtl/image.c
+++ b/reactos/lib/rtl/image.c
@@ -152,6 +152,7 @@ RtlImageRvaToVa (
 }
 
 PIMAGE_BASE_RELOCATION
+NTAPI
 LdrProcessRelocationBlockLongLong(
     IN ULONG_PTR Address,
     IN ULONG Count,