diff --git a/dlls/crypt32/crypt32.spec b/dlls/crypt32/crypt32.spec
index e639d7c5590..0d2a477c8eb 100644
--- a/dlls/crypt32/crypt32.spec
+++ b/dlls/crypt32/crypt32.spec
@@ -160,7 +160,7 @@
 @ stdcall CryptMsgOpenToEncode(long long long ptr str ptr)
 @ stdcall CryptMsgSignCTL(long ptr long ptr long ptr ptr)
 @ stdcall CryptMsgUpdate(ptr ptr long long)
-@ stub CryptMsgVerifyCountersignatureEncoded
+@ stdcall CryptMsgVerifyCountersignatureEncoded(ptr long ptr long ptr long ptr)
 @ stdcall CryptMsgVerifyCountersignatureEncodedEx(ptr long ptr long ptr long long ptr long ptr)
 @ stdcall CryptProtectData(ptr wstr ptr ptr ptr long ptr)
 @ stdcall CryptProtectMemory(ptr long long)
diff --git a/dlls/crypt32/msg.c b/dlls/crypt32/msg.c
index 13f59349631..80b2de78e95 100644
--- a/dlls/crypt32/msg.c
+++ b/dlls/crypt32/msg.c
@@ -3737,6 +3737,17 @@ BOOL WINAPI CryptMsgGetAndVerifySigner(HCRYPTMSG hCryptMsg, DWORD cSignerStore,
     return ret;
 }
 
+BOOL WINAPI CryptMsgVerifyCountersignatureEncoded(HCRYPTPROV_LEGACY hCryptProv,
+ DWORD dwEncodingType, BYTE *pbSignerInfo, DWORD cbSignerInfo,
+ PBYTE pbSignerInfoCountersignature, DWORD cbSignerInfoCountersignature,
+ CERT_INFO *pciCountersigner)
+{
+    FIXME("(%08lx, %08x, %p, %d, %p, %d, %p): stub\n", hCryptProv,
+     dwEncodingType, pbSignerInfo, cbSignerInfo, pbSignerInfoCountersignature,
+     cbSignerInfoCountersignature, pciCountersigner);
+    return FALSE;
+}
+
 BOOL WINAPI CryptMsgVerifyCountersignatureEncodedEx(HCRYPTPROV_LEGACY hCryptProv,
  DWORD dwEncodingType, PBYTE pbSignerInfo, DWORD cbSignerInfo,
  PBYTE pbSignerInfoCountersignature, DWORD cbSignerInfoCountersignature,