1 files changed, 4 insertions, 1 deletions
diff --git a/src/geodesic.c b/src/geodesic.c
index 5c038a33..d93268c6 100644
--- a/src/geodesic.c
+++ b/src/geodesic.c
@@ -85,7 +85,10 @@ static void Init() {
     tolb = tol0 * tol2;
     xthresh = 1000 * tol2;
     degree = pi/180;
-    NaN = sqrt(-1.0);
+    {
+        double minus1 = -1.0;
+        NaN = sqrt(minus1);
+    }
     init = 1;
   }
 }