diff --git a/firmware/common/file.h b/firmware/common/file.h
index ec80a51579..c608fbc6a0 100644
--- a/firmware/common/file.h
+++ b/firmware/common/file.h
@@ -24,6 +24,7 @@
 #define SEEK_CUR 1
 #define SEEK_END 2
 
+#ifndef SIMULATOR
 extern int open(char* pathname, int flags);
 extern int close(int fd);
 
@@ -31,6 +32,7 @@ extern int read(int fd, void* buf, int count);
 extern int write(int fd, void* buf, int count);
 
 extern int lseek(int fd, int offset, int whence);
+#endif
 
 extern int remove(char* pathname);
 extern int rename(char* oldname, char* newname);