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-rw-r--r--src/pattern_sim.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/pattern_sim.c b/src/pattern_sim.c
index f449b9c1..3f3d93ea 100644
--- a/src/pattern_sim.c
+++ b/src/pattern_sim.c
@@ -209,7 +209,7 @@ int main(int argc, char *argv[])
image.orientation = read_quaternion();
}
- if ( quaternion_valid(image.orientation) ) {
+ if ( !quaternion_valid(image.orientation) ) {
ERROR("Orientation modulus is not zero!\n");
return 1;
}