diff --git a/include/nuttx/usb/usb.h b/include/nuttx/usb/usb.h
index 8c4a23e4ce..2b70e1d796 100644
--- a/include/nuttx/usb/usb.h
+++ b/include/nuttx/usb/usb.h
@@ -65,10 +65,10 @@
 #define MSBYTE(u16)                             ((u16) >> 8)     /* Get MS byte from uint16_t */
 #define LSBYTE(u16)                             ((u16) & 0xff)   /* Get LS byte from uint16_t */
 
-#define GETUINT16(p)                            (((uint16_t)p[1] << 8) | (uint16_t)p[0])
-#define GETUINT32(p)                            (((uint32_t)p[3] << 24) | \
-                                                 ((uint32_t)p[2] << 16) | \
-                                                 ((uint32_t)p[1] << 8) | (uint32_t)p[0])
+#define GETUINT16(p)                            ((uint16_t)((uint16_t)(p[1] << 8) | (uint16_t)p[0]))
+#define GETUINT32(p)                            ((uint32_t)((uint32_t)p[3] << 24) | \
+                                                           ((uint32_t)p[2] << 16) | \
+                                                           ((uint32_t)p[1] << 8) | (uint32_t)p[0])
 
 /* USB directions (in endpoint addresses) */
 
diff --git a/net/sixlowpan/sixlowpan_internal.h b/net/sixlowpan/sixlowpan_internal.h
index 29626af8f6..a7abf9416a 100644
--- a/net/sixlowpan/sixlowpan_internal.h
+++ b/net/sixlowpan/sixlowpan_internal.h
@@ -103,7 +103,7 @@
 /* GET 16-bit data:  source in network order */
 
 #define GETUINT16(ptr,index) \
-  ((((uint16_t)((ptr)[index])) << 8) | ((uint16_t)(((ptr)[(index) + 1]))))
+  ((uint16_t)((((uint16_t)((ptr)[index])) << 8) | ((uint16_t)(((ptr)[(index) + 1])))))
 
 /* PUT 16-bit data:  source in host order, result in network order */