diff --git a/src/fixedint.h b/src/fixedint.h
index d03e4bd..1a8745b 100644
--- a/src/fixedint.h
+++ b/src/fixedint.h
@@ -17,6 +17,8 @@
 
 #ifndef FIXEDINT_H_INCLUDED
     #define FIXEDINT_H_INCLUDED
+    
+    #include <limits.h>
 
     /* (u)int32_t */
     #ifndef uint32_t