diff --git a/include/cdecl16.inc b/include/cdecl16.inc
index 13bdc50..81477e8 100644
--- a/include/cdecl16.inc
+++ b/include/cdecl16.inc
@@ -21,7 +21,7 @@
 %macro __CDECL16_ENTRY 0
     push bp
     mov bp, sp
-    sub sp, 0x20
+    sub sp, 0x10
 
     push si
     push di