diff --git a/cpu/pxa/mmc.c b/cpu/pxa/mmc.c
index 4495a80..8c529a3 100644
--- a/cpu/pxa/mmc.c
+++ b/cpu/pxa/mmc.c
@@ -535,7 +535,7 @@
 	mmc_dev.removable = 0;
 	mmc_dev.block_read = mmc_bread;
 
-	printf("Detected: %u blocks of %u bytes (%uMB) ", mmc_dev.lba,
+	printf("Detected: %lu blocks of %lu bytes (%luMB) ", (unsigned long)mmc_dev.lba,
 	       mmc_dev.blksz, mmc_dev.lba * mmc_dev.blksz / (1024 * 1024));
 }