diff --git a/ROMFS/px4fmu_test/mixers/complex_test.mix b/ROMFS/px4fmu_test/mixers/complex_test.mix
index 626ce556bf..06b5e62594 100644
--- a/ROMFS/px4fmu_test/mixers/complex_test.mix
+++ b/ROMFS/px4fmu_test/mixers/complex_test.mix
@@ -1,10 +1,9 @@
-M: 1
+M: 4
 O:      10000  10000      0 -10000  10000
 S: 0 0  10000  10000      0 -10000  10000
 S: 0 1  10000  10000      0 -10000  10000
 S: 0 2  10000  10000      0 -10000  10000
 S: 0 3  10000  10000      0 -10000  10000
-S: 0 4  10000  10000      0 -10000  10000
 M: 1
 O:      10000  10000      0 -10000  10000
 S: 0 1  10000  10000      0 -10000  10000