diff --git a/day5/p1.c b/day5/p1.c
index d458ac8..e33ffc1 100644
--- a/day5/p1.c
+++ b/day5/p1.c
@@ -31,7 +31,7 @@ int main(int argc, char **argv) {
         space_pos++;
     }
 
-    int64_t *data = (int64_t *) calloc(data_len, sizeof(int64_t));
+    uint64_t *data = (uint64_t *) calloc(data_len, sizeof(uint64_t));
     bool *data_v = (bool *) calloc(data_len, sizeof(bool));
 
     for (size_t i = 0, seeds_pos = (size_t) colon_pos+2;; seeds_pos++) {
@@ -48,8 +48,8 @@ int main(int argc, char **argv) {
             continue;
         }
 
-        int64_t dst = 0, src = 0, rng = 0;
-        sscanf(line, "%ld %ld %ld\n", &dst, &src, &rng);
+        uint64_t dst = 0, src = 0, rng = 0;
+        sscanf(line, "%lu %lu %lu\n", &dst, &src, &rng);
 
         for (size_t i = 0; i < data_len; ++i) {
             if (!data_v[i] && data[i] >= src && data[i] <= src+rng-1) {
@@ -61,12 +61,12 @@ int main(int argc, char **argv) {
         memset(line, 0, line_buf_length);
     }
 
-    int64_t lowest_loc_n = INT32_MAX;
+    uint64_t lowest_loc_n = INT32_MAX;
 
     for (size_t i = 0; i < data_len; ++i)
         lowest_loc_n = (data[i] < lowest_loc_n) ? data[i] : lowest_loc_n;
 
-    printf("%ld\n", lowest_loc_n);
+    printf("%lu\n", lowest_loc_n);
 
     return 0;
 }