diff --git a/imageInput.c b/imageInput.c
index 4d0ec1c..d8ad4f2 100644
--- a/imageInput.c
+++ b/imageInput.c
@@ -26,7 +26,8 @@ static void readPictureData(FILE *file, unsigned short *ptrPicturesCount, unsign
 GrayScaleImageSeries *readImages(const char *path)
 {
 	unsigned short picturesCount, pictureWidth, pictureHeight;
-    GrayScaleImageSeries *series = malloc(sizeof(GrayScaleImageSeries));;
+    GrayScaleImageSeries *series = malloc(sizeof(GrayScaleImageSeries));
+    char line[26];
 
     FILE *file = fopen(path,"rb");
 
@@ -36,6 +37,10 @@ GrayScaleImageSeries *readImages(const char *path)
         return NULL;
     }
 
+    fread(line, sizeof(line), 1, file);
+    if(strncmp(line, FILE_HEADER_STRING, strlen(FILE_HEADER_STRING))!=0)return NULL;
+
+    fseek(file, 0, SEEK_SET);
 
 
     readPictureData(file, &picturesCount, &pictureWidth, &pictureHeight);