diff --git a/src/gpio.cpp b/src/gpio.cpp
index 7689acf..00160d6 100644
--- a/src/gpio.cpp
+++ b/src/gpio.cpp
@@ -116,7 +116,7 @@ uint64_t clkgpio::GetPllFrequency(int PllNo)
 		Freq = XOSC_FREQUENCY * ((uint64_t)gpioreg[PLLH_CTRL] & 0x3ff) + XOSC_FREQUENCY * (uint64_t)gpioreg[PLLH_FRAC] / (1 << 20);
 		break;
 	}
-	fprintf(stderr, "Freq = %lld\n", Freq);
+	fprintf(stderr, "Freq = %lu\n", Freq);
 
 	return Freq;
 }
diff --git a/src/mailbox.c b/src/mailbox.c
index 4ef05ca..e172615 100644
--- a/src/mailbox.c
+++ b/src/mailbox.c
@@ -63,7 +63,7 @@ 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);