diff --git a/man1/memusage.1 b/man1/memusage.1
index 10fa18aee..cede2df3d 100644
--- a/man1/memusage.1
+++ b/man1/memusage.1
@@ -249,7 +249,7 @@ main(int argc, char *argv[])
     int *p;
 
     size = sizeof(*p) * 100;
-    printf("malloc: %zd\en", size);
+    printf("malloc: %zu\en", size);
     p = malloc(size);
 
     for (i = 0; i < CYCLES; i++) {
@@ -259,11 +259,11 @@ main(int argc, char *argv[])
             j--;
 
         size = sizeof(*p) * (j * 50 + 110);
-        printf("realloc: %zd\en", size);
+        printf("realloc: %zu\en", size);
         p = realloc(p, size);
 
         size = sizeof(*p) * ((j + 1) * 150 + 110);
-        printf("realloc: %zd\en", size);
+        printf("realloc: %zu\en", size);
         p = realloc(p, size);
     }