diff --git a/libcpuid/cpuid_main.c b/libcpuid/cpuid_main.c
index 0c228f8..65f844a 100644
--- a/libcpuid/cpuid_main.c
+++ b/libcpuid/cpuid_main.c
@@ -725,7 +725,7 @@ static int cpuid_basic_identify(struct cpu_raw_data_t* raw, struct cpu_id_t* dat
 			data->ext_family = data->family + xfamily;
 		data->ext_model = data->model + (xmodel << 4);
 	}
-	ext = raw->ext_cpuid[0][EAX] - 0x8000000;
+	ext = raw->ext_cpuid[0][EAX] - 0x80000000;
 
 	/* obtain the brand string, if present: */
 	if (ext >= 4) {