diff --git a/apps/openmw/mwmechanics/aitravel.cpp b/apps/openmw/mwmechanics/aitravel.cpp
index dd769f91c..25efe8fff 100644
--- a/apps/openmw/mwmechanics/aitravel.cpp
+++ b/apps/openmw/mwmechanics/aitravel.cpp
@@ -26,7 +26,7 @@ namespace MWMechanics
         return new AiTravel(*this);
     }
 
-    float sgn(float a)
+    static float sgn(float a)
     {
         if(a>0) return 1.;
         else return -1.;
diff --git a/apps/openmw/mwmechanics/pathfinding.cpp b/apps/openmw/mwmechanics/pathfinding.cpp
index fdac50dda..1d98674ef 100644
--- a/apps/openmw/mwmechanics/pathfinding.cpp
+++ b/apps/openmw/mwmechanics/pathfinding.cpp
@@ -23,7 +23,7 @@ namespace MWMechanics
         return sqrt(float(a.mX - b.mX)*(a.mX - b.mX)+(a.mY - b.mY)*(a.mY - b.mY)+(a.mZ - b.mZ)*(a.mZ - b.mZ));
     }
 
-    float sgn(float a)
+    static float sgn(float a)
     {
         if(a>0) return 1.;
         else return -1.;