diff --git a/reactos/lib/rtl/actctx.c b/reactos/lib/rtl/actctx.c
index 21b6753b299..f24ae51fad4 100644
--- a/reactos/lib/rtl/actctx.c
+++ b/reactos/lib/rtl/actctx.c
@@ -13,6 +13,8 @@
 #define NDEBUG
 #include <debug.h>
 
+#define QUERY_ACTCTX_FLAG_ACTIVE (0x00000001)
+
 /* FUNCTIONS ***************************************************************/
 
 VOID
@@ -80,6 +82,22 @@ RtlQueryInformationActivationContext(DWORD dwFlags,
     return STATUS_NOT_IMPLEMENTED;
 }
 
+NTSTATUS
+NTAPI
+RtlQueryInformationActiveActivationContext(ULONG ulInfoClass,
+                                           PVOID pvBuffer,
+                                           SIZE_T cbBuffer OPTIONAL,
+                                           SIZE_T *pcbWrittenOrRequired OPTIONAL)
+{
+    return RtlQueryInformationActivationContext(QUERY_ACTCTX_FLAG_ACTIVE,
+                                                NULL,
+                                                NULL,
+                                                ulInfoClass,
+                                                pvBuffer,
+                                                cbBuffer,
+                                                pcbWrittenOrRequired);
+}
+
 NTSTATUS
 NTAPI
 RtlZombifyActivationContext(PVOID Context)