diff --git a/main.c b/main.c
index c6665f0..69a4147 100644
--- a/main.c
+++ b/main.c
@@ -114,11 +114,11 @@ bool read_hex_byte(char *buf, char *val) {
 bool read_hex_i32(char *buf, int32_t *val) {
     char byte;
     *val = 0;
-    for (int i = 0; i < 8; i += 2) {
-        if (!read_hex_byte(buf + i, &byte)) {
+    for (int i = 0; i < 4; ++i) {
+        if (!read_hex_byte(buf + (i * 2), &byte)) {
             return false;
         }
-        *val |= ((int32_t) (uint8_t) byte) << i;
+        *val |= ((int32_t) (uint8_t) byte) << (i * 8);
     }
     return true;
 }