diff --git a/base16_from.c b/base16_from.c
index 0ae6d69..93148dc 100644
--- a/base16_from.c
+++ b/base16_from.c
@@ -77,6 +77,6 @@ int base16_valid(const char *src,size_t *count)
 		;
 
 	if (count)
-		*count = p - src;
+		*count = (size_t) (p - src);
 	return !*p;
 }
diff --git a/base32_from.c b/base32_from.c
index 35eb444..0f787e6 100644
--- a/base32_from.c
+++ b/base32_from.c
@@ -96,6 +96,6 @@ int base32_valid(const char *src,size_t *count)
 		;
 
 	if (count)
-		*count = p - src;
+		*count = (size_t) (p - src);
 	return !*p;
 }
diff --git a/ioutil.c b/ioutil.c
index 65bd944..f3b4c1f 100644
--- a/ioutil.c
+++ b/ioutil.c
@@ -20,7 +20,7 @@ int writeall(FH fd,const u8 *data,size_t len)
 				continue;
 			return -1;
 		}
-		len -= wrote;
+		len -= (size_t) wrote;
 		data += wrote;
 	}
 	return 0;