diff --git a/aarch64/corefreqm.c b/aarch64/corefreqm.c
index dd4b6031..8f121f34 100644
--- a/aarch64/corefreqm.c
+++ b/aarch64/corefreqm.c
@@ -4,6 +4,7 @@
  * Licenses: GPL2
  */
 
+#define _GNU_SOURCE
 #include <sys/ioctl.h>
 #include <pthread.h>
 #include <stdlib.h>
diff --git a/aarch64/coretypes.h b/aarch64/coretypes.h
index 6df2e5c6..7959adf3 100644
--- a/aarch64/coretypes.h
+++ b/aarch64/coretypes.h
@@ -662,10 +662,12 @@ enum OFFLINE
 	OS
 };
 
-typedef struct
-{
-	unsigned int	Q :  8-0,
-			R : 32-8;
+typedef union {
+	struct
+	{
+		unsigned int	Q :  8-0,
+				R : 32-8;
+	};
 } COF_ST;
 
 typedef struct
diff --git a/x86_64/corefreqm.c b/x86_64/corefreqm.c
index 652ba1d8..19bc46cc 100644
--- a/x86_64/corefreqm.c
+++ b/x86_64/corefreqm.c
@@ -4,6 +4,7 @@
  * Licenses: GPL2
  */
 
+#define _GNU_SOURCE
 #include <sys/ioctl.h>
 #include <pthread.h>
 #include <stdlib.h>