diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index ccb8018b831f..ab0a9c0ad7c0 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -253,7 +253,7 @@ static int intel_i810_insert_entries(struct agp_memory *mem, off_t pg_start,
 			mem->memory[i], mem->type),
 			intel_i810_private.registers+I810_PTE_BASE+(j*4));
 	}
-	readl(intel_i810_private.registers+I810_PTE_BASE+(j-1*4));	/* PCI Posting. */
+	readl(intel_i810_private.registers+I810_PTE_BASE+((j-1)*4));	/* PCI Posting. */
 
 	agp_bridge->driver->tlb_flush(mem);
 	return 0;