diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba71f83a..b464144d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -117,6 +117,7 @@ The git repositories are hosted at the following sites:
 
 ### Fixed
 
+* Fixed Lighting Output step operations mixup. (#1099)
 * Fixed Lighting Output step operations to set the Priority_Array slot. (#1098)
 * Fixed the lighting output objects current priority comparison during
   lighting commands by using priority 17 for relinquish default
diff --git a/src/bacnet/basic/object/lo.c b/src/bacnet/basic/object/lo.c
index 0e553969..e79ed360 100644
--- a/src/bacnet/basic/object/lo.c
+++ b/src/bacnet/basic/object/lo.c
@@ -1369,7 +1369,7 @@ bool Lighting_Output_Lighting_Command_Set(
                     "LO[%u]: Lighting-Command@%u Step "
                     "Step-Increment=%f\n",
                     object_instance, priority, (double)value->step_increment);
-                Lighting_Command_Step_Down_Off(
+                Lighting_Command_Step_Up_On(
                     pObject, priority, value->operation, value->step_increment);
                 status = true;
                 break;
@@ -1379,7 +1379,7 @@ bool Lighting_Output_Lighting_Command_Set(
                     "LO[%u]: Lighting-Command@%u Step "
                     "Step-Increment=%f\n",
                     object_instance, priority, (double)value->step_increment);
-                Lighting_Command_Step_Up_On(
+                Lighting_Command_Step_Down_Off(
                     pObject, priority, value->operation, value->step_increment);
                 status = true;
                 break;