diff --git a/Xext/bigreq.c b/Xext/bigreq.c
index 582b670b0..f9f15edc5 100644
--- a/Xext/bigreq.c
+++ b/Xext/bigreq.c
@@ -42,6 +42,8 @@ from The Open Group.
 
 static DISPATCH_PROC(ProcBigReqDispatch);
 
+void BigReqExtensionInit(INITARGS);
+
 void
 BigReqExtensionInit(INITARGS)
 {
diff --git a/Xext/syncsrv.h b/Xext/syncsrv.h
index 00e0bda50..6d0e3d64a 100644
--- a/Xext/syncsrv.h
+++ b/Xext/syncsrv.h
@@ -173,4 +173,5 @@ extern void SyncDestroySystemCounter(
 );
 extern void InitServertime(void);
 
+extern void SyncExtensionInit(void);
 #endif /* _SYNCSRV_H_ */
diff --git a/Xext/xcmisc.c b/Xext/xcmisc.c
index f644cb458..39079a294 100644
--- a/Xext/xcmisc.c
+++ b/Xext/xcmisc.c
@@ -55,6 +55,8 @@ static DISPATCH_PROC(SProcXCMiscGetVersion);
 static DISPATCH_PROC(SProcXCMiscGetXIDList);
 static DISPATCH_PROC(SProcXCMiscGetXIDRange);
 
+void XCMiscExtensionInit(INITARGS);
+
 void
 XCMiscExtensionInit(INITARGS)
 {