diff --git a/libs/kimath/src/trigo.cpp b/libs/kimath/src/trigo.cpp
index c61b091041..02b30ab32f 100644
--- a/libs/kimath/src/trigo.cpp
+++ b/libs/kimath/src/trigo.cpp
@@ -386,13 +386,19 @@ const VECTOR2D CalcArcCenter( const VECTOR2D& aStart, const VECTOR2D& aMid, cons
         return center;
     }
 
-    // Prevent div=0 errors
+    // Prevent div-by-0 errors
     if( xDelta_21 == 0.0 )
         xDelta_21 = std::numeric_limits<double>::epsilon();
 
     if( xDelta_32 == 0.0 )
         xDelta_32 = -std::numeric_limits<double>::epsilon();
 
+    if( yDelta_21 == 0.0 )
+        yDelta_21 = std::numeric_limits<double>::epsilon();
+
+    if( yDelta_32 == 0.0 )
+        yDelta_32 = -std::numeric_limits<double>::epsilon();
+
     double aSlope = yDelta_21 / xDelta_21;
     double bSlope = yDelta_32 / xDelta_32;