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-rw-r--r--src/PJ_collg.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/PJ_collg.c b/src/PJ_collg.c
index 80029a3a..939eb2d2 100644
--- a/src/PJ_collg.c
+++ b/src/PJ_collg.c
@@ -26,7 +26,7 @@ static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
if (fabs(lp.phi = 1. - lp.phi * lp.phi) < 1.)
lp.phi = asin(lp.phi);
else if (fabs(lp.phi) > ONEEPS) I_ERROR
- else lp.phi = lp.phi < 0. ? -HALFPI : HALFPI;
+ else lp.phi = lp.phi < 0. ? -M_HALFPI : M_HALFPI;
if ((lp.lam = 1. - sin(lp.phi)) <= 0.)
lp.lam = 0.;
else