diff --git a/Ghidra/Processors/AARCH64/data/languages/AARCH64_win.cspec b/Ghidra/Processors/AARCH64/data/languages/AARCH64_win.cspec
index 8e02453a7e..7f332a131d 100644
--- a/Ghidra/Processors/AARCH64/data/languages/AARCH64_win.cspec
+++ b/Ghidra/Processors/AARCH64/data/languages/AARCH64_win.cspec
@@ -192,6 +192,7 @@
         </killedbycall>
     </prototype>
   </default_proto>
+  <modelalias name="__stdcall" parent="__cdecl"/>
 
   <callfixup name="security_push_cookie">
   <target name="__security_push_cookie"/>
diff --git a/Ghidra/Processors/x86/data/languages/x86-64-win.cspec b/Ghidra/Processors/x86/data/languages/x86-64-win.cspec
index 907f981488..d0a7742618 100644
--- a/Ghidra/Processors/x86/data/languages/x86-64-win.cspec
+++ b/Ghidra/Processors/x86/data/languages/x86-64-win.cspec
@@ -201,6 +201,7 @@
     </localrange>
   </prototype>
   <modelalias name="__cdecl" parent="__fastcall"/>
+  <modelalias name="__stdcall" parent="__fastcall"/>
   <callfixup name="alloca_probe">
     <target name="_alloca_probe"/>
     <target name="_alloca_probe2"/>