diff --git a/ROMFS/px4fmu_common/mixers/firefly6.aux.mix b/ROMFS/px4fmu_common/mixers/firefly6.aux.mix
index fda8416403..22dc2a69ce 100644
--- a/ROMFS/px4fmu_common/mixers/firefly6.aux.mix
+++ b/ROMFS/px4fmu_common/mixers/firefly6.aux.mix
@@ -11,12 +11,12 @@ Elevon mixers
 -------------
 M: 2
 O:      10000  10000      0 -10000  10000
-S: 1 0   7500   7500      0 -10000  10000
+S: 1 0   -7500   -7500      0 -10000  10000
 S: 1 1   8000   8000      0 -10000  10000
 
 M: 2
 O:       10000   10000    0 -10000  10000
-S: 1 0    7500    7500    0 -10000  10000
+S: 1 0    -7500    -7500    0 -10000  10000
 S: 1 1   -8000   -8000    0 -10000  10000
 
 Landing gear mixer