diff --git a/src/matrix.h b/src/matrix.h
index 7485a598..f79fd14a 100644
--- a/src/matrix.h
+++ b/src/matrix.h
@@ -113,7 +113,8 @@ namespace lol
     \
     inline float len() const \
     { \
-        return std::sqrtf((float)sqlen()); \
+        using namespace std; \
+        return sqrtf((float)sqlen()); \
     }
 
 template <typename T> struct Vec2;
diff --git a/src/numeric.h b/src/numeric.h
index 8f72aa9f..7fd0ed31 100644
--- a/src/numeric.h
+++ b/src/numeric.h
@@ -26,7 +26,8 @@ namespace lol
 /* Random float value */
 static inline float RandF()
 {
-    return (float)std::rand() / RAND_MAX;
+    using namespace std;
+    return (float)rand() / RAND_MAX;
 }
 
 static inline float RandF(float val)