diff --git a/dlls/wintrust/Makefile.in b/dlls/wintrust/Makefile.in
index 22000f35233..de2b25e537b 100644
--- a/dlls/wintrust/Makefile.in
+++ b/dlls/wintrust/Makefile.in
@@ -4,7 +4,7 @@ SRCDIR    = @srcdir@
 VPATH     = @srcdir@
 MODULE    = wintrust.dll
 IMPORTLIB = libwintrust.$(IMPLIBEXT)
-IMPORTS   = kernel32
+IMPORTS   = crypt32 kernel32
 
 C_SRCS = wintrust_main.c
 
diff --git a/dlls/wintrust/wintrust.spec b/dlls/wintrust/wintrust.spec
index d5d09941af7..28de1555027 100644
--- a/dlls/wintrust/wintrust.spec
+++ b/dlls/wintrust/wintrust.spec
@@ -71,7 +71,7 @@
 @ stub TrustDecode
 @ stub TrustFindIssuerCertificate
 @ stub TrustFreeDecode
-@ stub TrustIsCertificateSelfSigned
+@ stdcall TrustIsCertificateSelfSigned(ptr)
 @ stub TrustOpenStores
 @ stub WTHelperCertFindIssuerCertificate
 @ stub WTHelperCertIsSelfSigned
diff --git a/dlls/wintrust/wintrust_main.c b/dlls/wintrust/wintrust_main.c
index 9d5f4e66353..6c56fcb336d 100644
--- a/dlls/wintrust/wintrust_main.c
+++ b/dlls/wintrust/wintrust_main.c
@@ -82,6 +82,19 @@ BOOL WINAPI CryptCATAdminReleaseContext(HCATADMIN hCatAdmin, DWORD dwFlags )
     return FALSE;
 }
 
+/***********************************************************************
+ *		TrustIsCertificateSelfSigned (WINTRUST.@)
+ */
+BOOL WINAPI TrustIsCertificateSelfSigned( PCCERT_CONTEXT cert )
+{
+    BOOL ret;
+
+    TRACE("%p\n", cert);
+    ret = CertCompareCertificateName(cert->dwCertEncodingType,
+     &cert->pCertInfo->Subject, &cert->pCertInfo->Issuer);
+    return ret;
+}
+
 /***********************************************************************
  *		WinVerifyTrust (WINTRUST.@)
  */