diff --git a/src/nv_hw.c b/src/nv_hw.c
index 2786e0d..87bb93c 100644
--- a/src/nv_hw.c
+++ b/src/nv_hw.c
@@ -297,6 +297,13 @@ bool NVLockVgaCrtcs(NVPtr pNv, bool lock)
 {
 	bool waslocked = !NVReadVgaCrtc(pNv, 0, NV_CIO_SR_LOCK_INDEX);
 
+	uint8_t cr11 = NVReadVgaCrtc(pNv, 1, NV_CIO_CR_VRE_INDEX);
+	if (lock)
+		cr11 |= 0x80;
+	else
+		cr11 &= ~0x80;
+	NVWriteVgaCrtc(pNv, 1, NV_CIO_CR_VRE_INDEX, cr11);
+
 	NVLockVgaCrtc(pNv, 0, lock);
 	/* NV11 has independently lockable crtcs, except when tied */
 	if (pNv->NVArch == 0x11 && !(nvReadMC(pNv, NV_PBUS_DEBUG_1) & (1 << 28)))