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-rw-r--r--src/PJ_cc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/PJ_cc.c b/src/PJ_cc.c
index 475fbae4..34194418 100644
--- a/src/PJ_cc.c
+++ b/src/PJ_cc.c
@@ -7,7 +7,7 @@ PROJ_HEAD(cc, "Central Cylindrical") "\n\tCyl, Sph";
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
- if (fabs (fabs(lp.phi) - HALFPI) <= EPS10) F_ERROR;
+ if (fabs (fabs(lp.phi) - M_HALFPI) <= EPS10) F_ERROR;
xy.x = lp.lam;
xy.y = tan(lp.phi);
return xy;