diff --git a/include/MCF5475.h b/include/MCF5475.h
index fa08e81..fca2361 100644
--- a/include/MCF5475.h
+++ b/include/MCF5475.h
@@ -23,6 +23,8 @@
  * linker symbols must be defined in the linker command file.
  */
 
+typedef uint32_t __attribute__((__may_alias__)) uint32_t_a;
+
 extern uint8_t _MBAR[];
 extern uint8_t _MMUBAR[];
 extern uint8_t _RAMBAR0[];
diff --git a/include/MCF5475_MMU.h b/include/MCF5475_MMU.h
index a865fd8..16794da 100644
--- a/include/MCF5475_MMU.h
+++ b/include/MCF5475_MMU.h
@@ -24,7 +24,9 @@
 *********************************************************************/
 
 /* Register read/write macros */
-#define MCF_MMU_MMUCR                        (*(volatile uint32_t*)(&_MMUBAR[0]))
+
+/* note the uint32_t_a - this is to avoid gcc warnings about pointer aliasing */
+#define MCF_MMU_MMUCR                        (*(volatile uint32_t_a*)(&_MMUBAR[0]))
 #define MCF_MMU_MMUOR                        (*(volatile uint32_t*)(&_MMUBAR[0x4]))
 #define MCF_MMU_MMUSR                        (*(volatile uint32_t*)(&_MMUBAR[0x8]))
 #define MCF_MMU_MMUAR                        (*(volatile uint32_t*)(&_MMUBAR[0x10]))