diff --git a/bhtree_mpi/src/datastructures/Body.cpp b/bhtree_mpi/src/datastructures/Body.cpp
index 23d485388a815a9a599fd0bdf2fccbe1e3e5251f..066d2e37ba5458135ec8183c0fa034d5aa5e0b4f 100644
--- a/bhtree_mpi/src/datastructures/Body.cpp
+++ b/bhtree_mpi/src/datastructures/Body.cpp
@@ -9,6 +9,7 @@
 #include <cstring>
 #include <cstdio>
 #include <algorithm>
+#include <cmath>
 
 namespace nbody {
 	using namespace std;
@@ -72,7 +73,7 @@ namespace nbody {
 	}
 
 	bool validDouble(double val) {
-		return !::isnan(val) && isfinite(val);
+		return !isnan(val) && isfinite(val);
 	}
 
 	bool validBody(Body body) {