Fix 32-bit builds
diff --git a/ltrace-elf.c b/ltrace-elf.c
index a311c5f..b1af070 100644
--- a/ltrace-elf.c
+++ b/ltrace-elf.c
@@ -175,8 +175,8 @@
 {
 	assert(data != NULL);
 	if (data->d_size < size || offset > data->d_size - size) {
-		debug(1, "Not enough data to read %zd-byte value"
-		      " at offset %zd.", size, offset);
+		debug(1, "Not enough data to read %"PRId64"-byte value"
+		      " at offset %"PRId64".", size, offset);
 		return -1;
 	}
 	return 0;