diff --git a/THANKS b/THANKS
index d02af36..cf29cd2 100644
--- a/THANKS
+++ b/THANKS
@@ -25,6 +25,7 @@ Ragnvald Maartman-Moe IV	<despair@quakeforge.net>
 Elias Mċrtensson		<@sun.com>
 Brady McCary			<mccary@tamu.edu>
 Faried Nawaz			<fn@hungry.org>
+Juhana Paavola			<jupaavol@ratol.fi>
 'RvB'				<hansmaulwurf@blinkenlights.ch>
 Victor Shkamerda		<vvs@auto.bnm.org>
 Jean-François St-Amour		<jfs@videotron.ca>
diff --git a/src/main.c b/src/main.c
index 77f6f2e..bab29cd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -527,7 +527,7 @@ size_t verify_fread(void * ptr, size_t size, size_t nitems, FILE * fp) {
     ret = fread(ptr, size, nitems, fp);
     err = errno;
     if (ret != nitems) {
-	printf("verify_fread(...,%d,%d,...): return value: %d\n", size, nitems, ret);
+	printf("verify_fread(...,%zd,%zd,...): return value: %zd\n", size, nitems, ret);
 	if (ret == 0 && ferror(fp)) {
 	    printf("   error: %s\n", strerror(err));
 	    printf("   fileno=%d\n", fileno(fp));
@@ -545,7 +545,7 @@ size_t verify_fwrite(void * ptr, size_t size, size_t nitems, FILE * fp) {
     ret = fwrite(ptr, size, nitems, fp);
     err = errno;
     if (ret != nitems) {
-	printf("verify_fwrite(...,%d,%d,...) = %d\n", size, nitems, ret);
+	printf("verify_fwrite(...,%zd,%zd,...) = %zd\n", size, nitems, ret);
 	if (ret == 0 && ferror(fp)) {
 	    printf("   error: %s\n", strerror(err));
 	    printf("   fileno=%d\n", fileno(fp));