diff --git a/src/Magnum/Implementation/QueryState.cpp b/src/Magnum/Implementation/QueryState.cpp
index 54b0b72e1..01a0932f1 100644
--- a/src/Magnum/Implementation/QueryState.cpp
+++ b/src/Magnum/Implementation/QueryState.cpp
@@ -25,6 +25,7 @@
 
 #include "QueryState.h"
 
+#include "Magnum/AbstractQuery.h"
 #include "Magnum/Context.h"
 #include "Magnum/Extensions.h"
 
diff --git a/src/Magnum/Implementation/QueryState.h b/src/Magnum/Implementation/QueryState.h
index 771135a3e..377cc697b 100644
--- a/src/Magnum/Implementation/QueryState.h
+++ b/src/Magnum/Implementation/QueryState.h
@@ -25,6 +25,7 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#include <string>
 #include <vector>
 
 #include "Magnum/Magnum.h"
diff --git a/src/Magnum/Implementation/TransformFeedbackState.cpp b/src/Magnum/Implementation/TransformFeedbackState.cpp
index dd90c63f4..020269ab8 100644
--- a/src/Magnum/Implementation/TransformFeedbackState.cpp
+++ b/src/Magnum/Implementation/TransformFeedbackState.cpp
@@ -1,5 +1,6 @@
 #include "TransformFeedbackState.h"
 
+#include "Magnum/Context.h"
 #include "Magnum/Extensions.h"
 #include "Magnum/TransformFeedback.h"
 
diff --git a/src/Magnum/Implementation/TransformFeedbackState.h b/src/Magnum/Implementation/TransformFeedbackState.h
index 97830a1bf..225dcdf0f 100644
--- a/src/Magnum/Implementation/TransformFeedbackState.h
+++ b/src/Magnum/Implementation/TransformFeedbackState.h
@@ -25,6 +25,7 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#include <string>
 #include <vector>
 
 #include "Magnum/Magnum.h"