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-rw-r--r--src/projections/putp4p.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/projections/putp4p.cpp b/src/projections/putp4p.cpp
index a5728b74..365f7c1b 100644
--- a/src/projections/putp4p.cpp
+++ b/src/projections/putp4p.cpp
@@ -22,7 +22,8 @@ static PJ_XY putp4p_s_forward (PJ_LP lp, PJ *P) { /* Spheroidal, forwa
lp.phi = aasin(P->ctx,0.883883476 * sin(lp.phi));
xy.x = Q->C_x * lp.lam * cos(lp.phi);
- xy.x /= cos(lp.phi *= 0.333333333333333);
+ lp.phi *= 0.333333333333333;
+ xy.x /= cos(lp.phi);
xy.y = Q->C_y * sin(lp.phi);
return xy;