diff --git a/compiler/x86/agx86att.pas b/compiler/x86/agx86att.pas
index ba0b7784aa..2ffe18aa7c 100644
--- a/compiler/x86/agx86att.pas
+++ b/compiler/x86/agx86att.pas
@@ -244,7 +244,7 @@ interface
             id     : as_gas;
             idtxt  : 'AS';
             asmbin : 'as';
-            asmcmd : '-o $OBJ $ASM';
+            asmcmd : '--64 -o $OBJ $ASM';
             supported_target : system_any;
             flags : [af_allowdirect,af_needar,af_smartlink_sections,af_supports_dwarf];
             labelprefix : '.L';
@@ -256,7 +256,7 @@ interface
             id     : as_gas;
             idtxt  : 'AS';
             asmbin : 'as';
-            asmcmd : '-o $OBJ $ASM';
+            asmcmd : '--32 -o $OBJ $ASM';
             supported_target : system_any;
             flags : [af_allowdirect,af_needar,af_smartlink_sections,af_supports_dwarf];
             labelprefix : '.L';