diff --git a/sys/dev/agp/agp_intel.c b/sys/dev/agp/agp_intel.c
index 84fd071ee87..047ed570ab9 100644
--- a/sys/dev/agp/agp_intel.c
+++ b/sys/dev/agp/agp_intel.c
@@ -373,7 +373,7 @@ agp_intel_flush_tlb(device_t dev)
 	u_int32_t val;
 
 	val = pci_read_config(dev, AGP_INTEL_AGPCTRL, 4);
-	pci_write_config(dev, AGP_INTEL_AGPCTRL, val & ~(1 << 8), 4);
+	pci_write_config(dev, AGP_INTEL_AGPCTRL, val & ~(1 << 7), 4);
 	pci_write_config(dev, AGP_INTEL_AGPCTRL, val, 4);
 }
 
diff --git a/sys/pci/agp_intel.c b/sys/pci/agp_intel.c
index 84fd071ee87..047ed570ab9 100644
--- a/sys/pci/agp_intel.c
+++ b/sys/pci/agp_intel.c
@@ -373,7 +373,7 @@ agp_intel_flush_tlb(device_t dev)
 	u_int32_t val;
 
 	val = pci_read_config(dev, AGP_INTEL_AGPCTRL, 4);
-	pci_write_config(dev, AGP_INTEL_AGPCTRL, val & ~(1 << 8), 4);
+	pci_write_config(dev, AGP_INTEL_AGPCTRL, val & ~(1 << 7), 4);
 	pci_write_config(dev, AGP_INTEL_AGPCTRL, val, 4);
 }