diff --git a/reactos/dll/win32/samsrv/samsrv.c b/reactos/dll/win32/samsrv/samsrv.c
index 07d9974ec6e..d8f5cb653e5 100644
--- a/reactos/dll/win32/samsrv/samsrv.c
+++ b/reactos/dll/win32/samsrv/samsrv.c
@@ -165,6 +165,20 @@ SamIFree_SAMPR_ENUMERATION_BUFFER(PSAMPR_ENUMERATION_BUFFER Ptr)
 }
 
 
+VOID
+NTAPI
+SamIFree_SAMPR_GET_GROUPS_BUFFER(PSAMPR_GET_GROUPS_BUFFER Ptr)
+{
+    if (Ptr != NULL)
+    {
+        if (Ptr->Groups != NULL)
+            MIDL_user_free(Ptr->Groups);
+
+        MIDL_user_free(Ptr);
+    }
+}
+
+
 VOID
 NTAPI
 SamIFree_SAMPR_PSID_ARRAY(PSAMPR_PSID_ARRAY Ptr)
diff --git a/reactos/dll/win32/samsrv/samsrv.spec b/reactos/dll/win32/samsrv/samsrv.spec
index f7129cfd7fd..97f1b771ef4 100644
--- a/reactos/dll/win32/samsrv/samsrv.spec
+++ b/reactos/dll/win32/samsrv/samsrv.spec
@@ -21,7 +21,7 @@
 @ stub SamIFree_SAMPR_DISPLAY_INFO_BUFFER
 @ stub SamIFree_SAMPR_DOMAIN_INFO_BUFFER
 @ stdcall SamIFree_SAMPR_ENUMERATION_BUFFER(ptr)
-@ stub SamIFree_SAMPR_GET_GROUPS_BUFFER
+@ stdcall SamIFree_SAMPR_GET_GROUPS_BUFFER(ptr)
 @ stub SamIFree_SAMPR_GET_MEMBERS_BUFFER
 @ stub SamIFree_SAMPR_GROUP_INFO_BUFFER
 @ stdcall SamIFree_SAMPR_PSID_ARRAY(ptr)