diff --git a/src/smax-messages.c b/src/smax-messages.c
index b68db9f..081e1c5 100644
--- a/src/smax-messages.c
+++ b/src/smax-messages.c
@@ -199,7 +199,7 @@ int smaxSendProgress(double fraction, const char *msg) {
   }
 
   progress = malloc(10 + strlen(msg));
-  if(!progress) return x_error(X_NULL, errno, fn, "malloc() error (%d bytes)", 10 + strlen(msg));
+  if(!progress) return x_error(X_NULL, errno, fn, "malloc() error (%ld bytes)", 10 + (long) strlen(msg));
 
   sprintf(progress, "%.1f %s", (100.0 * fraction), msg);
 
diff --git a/src/smax-util.c b/src/smax-util.c
index 7cd60ec..20f649c 100644
--- a/src/smax-util.c
+++ b/src/smax-util.c
@@ -1165,7 +1165,7 @@ int smaxDeletePattern(const char *pattern) {
   prop_error(fn, n);
 
   metaPattern = (char *) malloc(strlen(pattern) + 20);
-  if(!metaPattern) return x_error(X_NULL, errno, fn, "malloc() error (%d bytes)", strlen(pattern) + 20);
+  if(!metaPattern) return x_error(X_NULL, errno, fn, "malloc() error (%ld bytes)", (long) strlen(pattern) + 20);
 
   sprintf(metaPattern, "<*>" X_SEP "%s", pattern);
   redisxDeleteEntries(smaxGetRedis(), metaPattern);