diff --git a/backtracking/wildcard_matching.cpp b/backtracking/wildcard_matching.cpp
index d9163a41b..b637f9f2d 100644
--- a/backtracking/wildcard_matching.cpp
+++ b/backtracking/wildcard_matching.cpp
@@ -12,6 +12,7 @@
  */
 
 #include <cassert>   /// for assert
+#include <cstdint>   /// for integral typedefs
 #include <iostream>  /// for IO operations
 #include <vector>    /// for std::vector