diff --git a/newfs_pascal.cpp b/newfs_pascal.cpp
index 9a434aa..4aca6cd 100644
--- a/newfs_pascal.cpp
+++ b/newfs_pascal.cpp
@@ -10,6 +10,7 @@
 #include <cstdio>
 #include <cstring>
 #include <cerrno>
+#include <cstdlib>
 
 #include <unistd.h>
 #include <sys/stat.h>
@@ -276,4 +277,4 @@ int main(int argc, char **argv)
     }
     
     return 0;
-}
\ No newline at end of file
+}