diff --git a/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrarytopaths.code.tex b/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrarytopaths.code.tex
index b719271d5..2051fce8f 100644
--- a/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrarytopaths.code.tex
+++ b/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrarytopaths.code.tex
@@ -34,9 +34,7 @@
     \pgfmathsetmacro\tikz@to@bend{#1}%
   \fi%
   \let\tikz@to@out=\tikz@to@bend%
-  \c@pgf@counta=180\relax%
-  \advance\c@pgf@counta by-\tikz@to@out\relax%
-  \edef\tikz@to@in{\the\c@pgf@counta}%
+  \pgfmathsetmacro\tikz@to@in{180-\tikz@to@out}%
   \tikz@to@switch@on%
   \tikz@to@relativetrue%
 }