diff --git a/src/content_sao.cpp b/src/content_sao.cpp
index bf8282af..840e04ed 100644
--- a/src/content_sao.cpp
+++ b/src/content_sao.cpp
@@ -18,6 +18,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 */
 
 #include "content_sao.h"
+#include "util/mathconstants.h"
 #include "util/serialize.h"
 #include "collision.h"
 #include "environment.h"
diff --git a/src/treegen.cpp b/src/treegen.cpp
index 4df574f3..e6c514ab 100644
--- a/src/treegen.cpp
+++ b/src/treegen.cpp
@@ -21,6 +21,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <stack>
 #include "util/pointer.h"
 #include "util/numeric.h"
+#include "util/mathconstants.h"
 #include "map.h"
 #include "serverenvironment.h"
 #include "nodedef.h"