diff --git a/day_2/1.c b/day_2/1.c
index 8abb071..9e65533 100644
--- a/day_2/1.c
+++ b/day_2/1.c
@@ -3,10 +3,12 @@
 #include <string.h>
 #include <stdbool.h>
 
+#define BUFFER_SIZE 1024
+
 typedef struct levels {
   size_t mem_size;
   size_t size;
-  unsigned int *data;
+  int *data;
 } levels_t;
 
 int main(void) {
@@ -17,8 +19,7 @@ int main(void) {
     return 1;
   }
 
-  char *line = NULL;
-  size_t size;
+  char buffer[BUFFER_SIZE];
 
   levels_t levels;
   levels.mem_size = 10;
@@ -26,8 +27,8 @@ int main(void) {
   levels.data = malloc(sizeof(unsigned int) * levels.mem_size);
 
   unsigned int sum = 0;
-  while (getline(&line, &size, fp) > 0) {
-    char *next = strtok(line, " ");
+  while (fgets(buffer, BUFFER_SIZE, fp) != NULL) {
+    char *next = strtok(buffer, " ");
 
     while (next != NULL) {
       if (levels.size >= levels.mem_size) {
@@ -36,7 +37,7 @@ int main(void) {
             realloc(levels.data, levels.mem_size * sizeof(unsigned int));
       }
 
-      sscanf(next, "%u", &levels.data[levels.size]);
+      sscanf(next, "%d", &levels.data[levels.size]);
       levels.size++;
 
       next = strtok(NULL, " ");
@@ -45,7 +46,7 @@ int main(void) {
     bool safe = true;
     int diff = levels.data[1] - levels.data[0];
     int increasing = diff > 0 ? 1 : -1;
-    for (int i = 1; i < levels.size; i++) {
+    for (size_t i = 1; i < levels.size; i++) {
       diff = increasing * (levels.data[i] - levels.data[i - 1]);
 
       if (diff < 1 || diff > 3) {
@@ -61,7 +62,6 @@ int main(void) {
     levels.size = 0;
   }
 
-  free(line);
   free(levels.data);
 
   printf("%u\n", sum);
@@ -69,4 +69,4 @@ int main(void) {
   fclose(fp);
 
   return 0;
-}
\ No newline at end of file
+}