diff --git a/include/llvm/ADT/DenseMap.h b/include/llvm/ADT/DenseMap.h
index 40cf3294982..5b1b3b42edb 100644
--- a/include/llvm/ADT/DenseMap.h
+++ b/include/llvm/ADT/DenseMap.h
@@ -22,6 +22,7 @@
 
 #include <functional>
 #include <vector>
+#include <cassert>
 
 namespace llvm {
 
diff --git a/include/llvm/ADT/IndexedMap.h b/include/llvm/ADT/IndexedMap.h
index 40cf3294982..5b1b3b42edb 100644
--- a/include/llvm/ADT/IndexedMap.h
+++ b/include/llvm/ADT/IndexedMap.h
@@ -22,6 +22,7 @@
 
 #include <functional>
 #include <vector>
+#include <cassert>
 
 namespace llvm {