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-rw-r--r--src/PJ_geos.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/PJ_geos.c b/src/PJ_geos.c
index d830c32c..f0a9bc24 100644
--- a/src/PJ_geos.c
+++ b/src/PJ_geos.c
@@ -206,7 +206,8 @@ PJ *PROJECTION(geos) {
if (sweep_axis == NULL)
Q->flip_axis = 0;
else {
- if (sweep_axis[1] != '\0' || (sweep_axis[0] != 'x' && sweep_axis[0] != 'y'))
+ if ((sweep_axis[0] != 'x' && sweep_axis[0] != 'y') ||
+ sweep_axis[1] != '\0')
return pj_default_destructor (P, PJD_ERR_INVALID_SWEEP_AXIS);
if (sweep_axis[0] == 'x')