diff --git a/desktop_version/src/Entity.cpp b/desktop_version/src/Entity.cpp
index 1d2eab1f..78ebfc13 100644
--- a/desktop_version/src/Entity.cpp
+++ b/desktop_version/src/Entity.cpp
@@ -1215,7 +1215,7 @@ void entityclass::revertlinecross(std::vector<entclass>& linecrosskludge, int t,
     entities[t].life = linecrosskludge[s].life;
 }
 
-bool entityclass::gridmatch( int p1, int p2, int p3, int p4, int p11, int p21, int p31, int p41 )
+static bool gridmatch( int p1, int p2, int p3, int p4, int p11, int p21, int p31, int p41 )
 {
     if (p1 == p11 && p2 == p21 && p3 == p31 && p4 == p41) return true;
     return false;
diff --git a/desktop_version/src/Entity.h b/desktop_version/src/Entity.h
index 75b068a1..695d0f27 100644
--- a/desktop_version/src/Entity.h
+++ b/desktop_version/src/Entity.h
@@ -82,8 +82,6 @@ public:
 
     void revertlinecross(std::vector<entclass>& linecrosskludge, int t, int s);
 
-    bool gridmatch(int p1, int p2, int p3, int p4, int p11, int p21, int p31, int p41);
-
     void createentity(int xp, int yp, int t, int meta1, int meta2,
                       int p1, int p2, int p3, int p4);
     void createentity(int xp, int yp, int t, int meta1, int meta2,