diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,8 +1,8 @@
 # Revision history for juicy-gcode
 
-## 0.1.0.5  -- 2018-03-16
+## 0.1.0.5  -- 2018-08-08
 
-* Update README
+* Simplify special bezier curves to lines
 
 ## 0.1.0.4  -- 2017-12-30
 
diff --git a/juicy-gcode.cabal b/juicy-gcode.cabal
--- a/juicy-gcode.cabal
+++ b/juicy-gcode.cabal
@@ -1,5 +1,5 @@
 name:                juicy-gcode
-version:             0.1.0.5
+version:             0.1.0.5.1
 license:             BSD3
 license-file:        LICENSE
 author:              dlacko
@@ -23,13 +23,13 @@
     
   build-depends:       
     base                    >=4.8    && <5, 
-    lens                    >=4.15.4 && <4.16,
+    lens                    >=4.15.4 && <4.18,
     linear                  >=1.20   && <1.21,
     optparse-applicative    >=0.13   && <0.14,
     configurator            >=0.3    && <0.4,
     text                    >=1.2.2  && <1.3,
     matrix                  >=0.3.5  && <0.4,
-    svg-tree                >=0.5    && <0.6
+    svg-tree                >=0.6    && <0.7
 
   GHC-Options:              -Wall
   default-language:         Haskell2010  
diff --git a/src/Render.hs b/src/Render.hs
--- a/src/Render.hs
+++ b/src/Render.hs
@@ -43,10 +43,17 @@
 -- convert a quadratic bezier to a cubic one
 bezierQ2C :: Point -> Point -> Point -> DrawOp
 bezierQ2C (qp0x, qp0y) (qp1x, qp1y) (qp2x, qp2y) 
-    = DBezierTo (qp0x + 2.0 / 3.0 * (qp1x - qp0x), qp0y + 2.0 / 3.0 * (qp1y - qp0y))
-                (qp2x + 2.0 / 3.0 * (qp1x - qp2x), qp2y + 2.0 / 3.0 * (qp1y - qp2y))
-                (qp2x, qp2y)
+    = createBezier (qp0x + 2.0 / 3.0 * (qp1x - qp0x), qp0y + 2.0 / 3.0 * (qp1y - qp0y))
+                   (qp2x + 2.0 / 3.0 * (qp1x - qp2x), qp2y + 2.0 / 3.0 * (qp1y - qp2y))
+                   (qp2x, qp2y)
 
+-- create a cubic bezier dta constructor from two control and one endpoints
+-- tries to simplify as well. it happens that the points actually describe a line, converting it to arcs would fail later on
+createBezier :: Point -> Point -> Point -> DrawOp 
+createBezier c1 c2 e 
+    | (c1 == c2) && (c2 == e) = DMoveTo e  
+    | otherwise = DBezierTo c1 c2 e   
+   
 toAbsolute :: (Double, Double) -> SVG.Origin -> (Double, Double) -> (Double, Double)
 toAbsolute _ SVG.OriginAbsolute p = p
 toAbsolute (cx,cy) SVG.OriginRelative (dx,dy) = (cx+dx, cy+dy)
@@ -117,7 +124,7 @@
                 cont dys' = SVG.VerticalTo SVG.OriginRelative dys' : ds  
                 
         renderPathCommands firstp currentp _ (SVG.CurveTo origin ((c1,c2,p):ps):ds) 
-            = DBezierTo ac1 ac2 ap : renderPathCommands firstp ap (Just ac2) (cont ps)
+            = createBezier ac1 ac2 ap : renderPathCommands firstp ap (Just ac2) (cont ps)
             where
                 ap = toAbsolute currentp origin (fromRPoint p)
                 ac1 = toAbsolute currentp origin (fromRPoint c1)
@@ -127,7 +134,7 @@
                 cont ps' = SVG.CurveTo origin ps' : ds
 
         renderPathCommands firstp currentp mbControlp (SVG.SmoothCurveTo origin ((c2,p):ps):ds) 
-            = DBezierTo ac1 ac2 ap : renderPathCommands firstp ap (Just ac2) (cont ps)
+            = createBezier ac1 ac2 ap : renderPathCommands firstp ap (Just ac2) (cont ps)
             where
                 ap = toAbsolute currentp origin (fromRPoint p)
                 ac1 = maybe ac2 (mirrorControlPoint currentp) mbControlp