diff --git a/rtengine/myfile.h b/rtengine/myfile.h
index 771dd7b84..e4609c697 100644
--- a/rtengine/myfile.h
+++ b/rtengine/myfile.h
@@ -68,7 +68,10 @@ inline void fseek (IMFILE* f, int p, int how)
     } else if (how == SEEK_CUR) {
         f->pos += p;
     } else if (how == SEEK_END) {
-        f->pos = f->size + p;
+        if(p <= 0 && -p <= f->size) {
+            f->pos = f->size + p;
+        }
+        return;
     }
 
     if (f->pos < 0  || f->pos > f->size) {