diff --git a/mailbox.c b/mailbox.c
index 3f0ece0..aee1f2a 100644
--- a/mailbox.c
+++ b/mailbox.c
@@ -33,6 +33,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <sys/mman.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
+#include <sys/sysmacros.h>
 
 #include "mailbox.h"
 
@@ -59,7 +60,7 @@ void *mapmem(unsigned base, unsigned size)
     printf("base=0x%x, mem=%p\n", base, mem);
 #endif
     if (mem == MAP_FAILED) {
-        printf("mmap error %d\n", (int)mem);
+        printf("mmap error %p\n", mem);
         exit (-1);
     }
     close(mem_fd);
diff --git a/wspr.cpp b/wspr.cpp
index a32f931..b1f2f78 100644
--- a/wspr.cpp
+++ b/wspr.cpp
@@ -262,8 +262,8 @@ void getRealMemPageFromPool(void ** vAddr, void **bAddr) {
     ABORT(-1);
   }
   unsigned offset = mbox.pool_cnt*4096;
-  *vAddr = (void*)(((unsigned)mbox.virt_addr) + offset);
-  *bAddr = (void*)(((unsigned)mbox.bus_addr) + offset);
+  *vAddr = (void*)(((uintptr_t)mbox.virt_addr) + offset);
+  *bAddr = (void*)(((uintptr_t)mbox.bus_addr) + offset);
   //printf("getRealMemoryPageFromPool bus_addr=%x virt_addr=%x\n", (unsigned)*pAddr,(unsigned)*vAddr);
   mbox.pool_cnt++;
 }