diff --git a/tools/k4aviewer/k4aaudiochanneldatagraph.h b/tools/k4aviewer/k4aaudiochanneldatagraph.h
index 9aede89..56d2c77 100644
--- a/tools/k4aviewer/k4aaudiochanneldatagraph.h
+++ b/tools/k4aviewer/k4aaudiochanneldatagraph.h
@@ -7,6 +7,7 @@
 // System headers
 //
 #include <array>
+#include <string>
 
 // Library headers
 //
diff --git a/tools/k4aviewer/k4aaudiowindow.h b/tools/k4aviewer/k4aaudiowindow.h
index 87b63b3..fcfc86e 100644
--- a/tools/k4aviewer/k4aaudiowindow.h
+++ b/tools/k4aviewer/k4aaudiowindow.h
@@ -8,6 +8,7 @@
 //
 #include <array>
 #include <memory>
+#include <string>
 
 // Library headers
 //
diff --git a/tools/k4aviewer/k4amicrophonelistener.cpp b/tools/k4aviewer/k4amicrophonelistener.cpp
index db7b546..8baa05c 100644
--- a/tools/k4aviewer/k4amicrophonelistener.cpp
+++ b/tools/k4aviewer/k4amicrophonelistener.cpp
@@ -8,6 +8,7 @@
 // System headers
 //
 #include <regex>
+#include <string>
 
 // Library headers
 //
diff --git a/tools/k4aviewer/perfcounter.h b/tools/k4aviewer/perfcounter.h
index b39e721..c3e28d2 100644
--- a/tools/k4aviewer/perfcounter.h
+++ b/tools/k4aviewer/perfcounter.h
@@ -13,6 +13,7 @@
 #include <mutex>
 #include <numeric>
 #include <ratio>
+#include <string>
 
 // Library headers
 //