diff --git a/src/fs/fs.c b/src/fs/fs.c
index 3353774..2ddd6b0 100644
--- a/src/fs/fs.c
+++ b/src/fs/fs.c
@@ -14,21 +14,13 @@ THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR I
 
 // Get file size. returns 18446744073709551615 (uint64_t maximum value) if something went wrong
 uint64_t file_size(char* path) {
-    FILE* file_stream;
-    uint64_t file_size;
+    struct stat file_stats;
 
-    file_stream = fopen(path, "rb");
-    if (!file_stream) {
+    if (stat(path , &file_stats) != 0) {
         return UINT64_MAX;
     }
 
-    fseek(file_stream, 0, SEEK_END);
-    file_size = ftell(file_stream);
-    fseek(file_stream, 0, SEEK_SET);
-
-    fclose(file_stream);
-
-    return file_size;
+    return (uint64_t) file_stats.st_size;
 }
 
 // Copy file at path_src to path_dst. Does not create nonexistent directories. Returns -1 in case of an error and 0 if the operation was sucessfull
diff --git a/src/fs/fs.h b/src/fs/fs.h
index ca47a44..8befbc1 100644
--- a/src/fs/fs.h
+++ b/src/fs/fs.h
@@ -13,6 +13,11 @@ THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR I
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
+#include <sys/stat.h>
+
+#if __WIN32__
+#define stat _stat64
+#endif
 
 // Get file size. returns 18446744073709551615 (uint64_t maximum value) if something went wrong
 uint64_t file_size(char* path);
diff --git a/testing/test.c b/testing/test.c
index 05bed1c..80605fe 100644
--- a/testing/test.c
+++ b/testing/test.c
@@ -121,7 +121,7 @@ int test_endian() {
 
 int test_fs() {
     if (file_size("test_img512x512.ppm") == UINT64_MAX) {
-        printf("[ERROR] Failed to determine file size of test ppm image");
+        printf("[ERROR] Failed to determine file size of test ppm image\n");
         return EXIT_FAILURE;
     }