diff --git a/dix/resource_priv.h b/dix/resource_priv.h
index c398ecdba..4e641e583 100644
--- a/dix/resource_priv.h
+++ b/dix/resource_priv.h
@@ -115,4 +115,18 @@ static inline Bool dixResouceIsServerOwned(XID xid) {
     return (dixClientForXID(xid) == serverClient);
 }
 
+/*
+ * @brief hash a XID for using as hashtable index
+ *
+ * @param id the XID to hash
+ * @param numBits number of bits in the resulting hash (>=0)
+ * @result the computed hash value
+ *
+ * @note This function is really only for handling
+ * INITHASHSIZE..MAXHASHSIZE bit hashes, but will handle any number
+ * of bits by either masking numBits lower bits of the ID or by
+ * providing at most MAXHASHSIZE hashes.
+ */
+int HashResourceID(XID id, unsigned int numBits);
+
 #endif /* _XSERVER_DIX_RESOURCE_PRIV_H */
diff --git a/include/resource.h b/include/resource.h
index 3451eb5d2..4742f6add 100644
--- a/include/resource.h
+++ b/include/resource.h
@@ -259,16 +259,4 @@ extern _X_EXPORT unsigned int GetXIDList(ClientPtr /*client */ ,
 extern _X_EXPORT RESTYPE lastResourceType;
 extern _X_EXPORT RESTYPE TypeMask;
 
-/** @brief A hashing function to be used for hashing resource IDs
-
-    @param id The resource ID to hash
-    @param numBits The number of bits in the resulting hash. Must be >=0.
-
-    @note This function is really only for handling
-    INITHASHSIZE..MAXHASHSIZE bit hashes, but will handle any number
-    of bits by either masking numBits lower bits of the ID or by
-    providing at most MAXHASHSIZE hashes.
-*/
-extern _X_EXPORT int HashResourceID(XID id, unsigned int numBits);
-
 #endif /* RESOURCE_H */