diff --git a/dlls/cryptui/cryptui.spec b/dlls/cryptui/cryptui.spec
index a60c2e6b92c..d243217406c 100644
--- a/dlls/cryptui/cryptui.spec
+++ b/dlls/cryptui/cryptui.spec
@@ -16,7 +16,7 @@
 16 stub CryptUIDlgViewCertificatePropertiesW
 17 stdcall CryptUIDlgViewCertificateW(ptr ptr)
 18 stdcall CryptUIDlgViewContext(long ptr ptr wstr long ptr)
-19 stub CryptUIDlgViewSignerInfoA
+19 stdcall CryptUIDlgViewSignerInfoA(ptr)
 20 stub CryptUIDlgViewSignerInfoW
 21 stub CryptUIFreeCertificatePropertiesPagesA
 22 stub CryptUIFreeCertificatePropertiesPagesW
diff --git a/dlls/cryptui/main.c b/dlls/cryptui/main.c
index 3a8f8f809e9..b823b6e9cd6 100644
--- a/dlls/cryptui/main.c
+++ b/dlls/cryptui/main.c
@@ -7038,3 +7038,9 @@ BOOL WINAPI CryptUIWizExport(DWORD dwFlags, HWND hwndParent,
     }
     return ret;
 }
+
+BOOL WINAPI CryptUIDlgViewSignerInfoA(CRYPTUI_VIEWSIGNERINFO_STRUCTA *pcvsi)
+{
+    FIXME("%p: stub\n", pcvsi);
+    return FALSE;
+}