diff --git a/dlls/advapi32/advapi32.spec b/dlls/advapi32/advapi32.spec
index f1cae1f88f1..40ae014f2dc 100644
--- a/dlls/advapi32/advapi32.spec
+++ b/dlls/advapi32/advapi32.spec
@@ -806,7 +806,7 @@
 # @ stub WmiMofEnumerateResourcesW
 # @ stub WmiNotificationRegistrationA
 # @ stub WmiNotificationRegistrationW
-@ stub WmiOpenBlock
+@ stdcall WmiOpenBlock(ptr long ptr)
 # @ stub WmiOpenTraceWithCursor
 # @ stub WmiParseTraceEvent
 # @ stub WmiQueryAllDataA
diff --git a/dlls/advapi32/eventlog.c b/dlls/advapi32/eventlog.c
index cc10935aefd..988060fe323 100644
--- a/dlls/advapi32/eventlog.c
+++ b/dlls/advapi32/eventlog.c
@@ -997,3 +997,12 @@ ULONG WINAPI EnumerateTraceGuids(PTRACE_GUID_PROPERTIES *propertiesarray,
     FIXME("%p %d %p: stub\n", propertiesarray, arraycount, guidcount);
     return ERROR_INVALID_PARAMETER;
 }
+
+/******************************************************************************
+ * WmiOpenBlock [ADVAPI32.@]
+ */
+NTSTATUS WINAPI WmiOpenBlock(GUID *guid, ULONG access, PVOID *datablock)
+{
+    FIXME("%s %d %p: stub\n", debugstr_guid(guid), access, datablock);
+    return ERROR_SUCCESS;
+}