diff --git a/LEGO1/lego/legoomni/include/legoutils.h b/LEGO1/lego/legoomni/include/legoutils.h
index 1328661b..55b65bea 100644
--- a/LEGO1/lego/legoomni/include/legoutils.h
+++ b/LEGO1/lego/legoomni/include/legoutils.h
@@ -25,7 +25,7 @@ void FUN_1003ef00(MxBool);
 void SetAppCursor(WPARAM p_wparam);
 MxBool FUN_1003ef60();
 MxBool RemoveFromWorld(MxAtomId& p_entityAtom, MxS32 p_entityId, MxAtomId& p_worldAtom, MxS32 p_worldEntityId);
-MxS32 UpdateLightPosition(MxS32 p_index);
+MxS32 UpdateLightPosition(MxS32 p_increase);
 void SetLightPosition(MxS32 p_index);
 LegoNamedTexture* ReadNamedTexture(LegoFile* p_file);
 void FUN_1003f540(LegoFile* p_file, const char* p_filename);
diff --git a/LEGO1/lego/legoomni/src/common/legoutils.cpp b/LEGO1/lego/legoomni/src/common/legoutils.cpp
index 92d1804b..b5f7fde1 100644
--- a/LEGO1/lego/legoomni/src/common/legoutils.cpp
+++ b/LEGO1/lego/legoomni/src/common/legoutils.cpp
@@ -342,11 +342,12 @@ MxBool FUN_1003ef60()
 }
 
 // FUNCTION: LEGO1 0x1003f050
-MxS32 UpdateLightPosition(MxS32 p_index)
+MxS32 UpdateLightPosition(MxS32 p_increase)
 {
 	MxS32 lightPosition = atoi(VariableTable()->GetVariable("lightposition"));
 
-	if (p_index > 0) {
+	// Only ever increases by 1 irrespective of p_increase
+	if (p_increase > 0) {
 		lightPosition += 1;
 		if (lightPosition > 5) {
 			lightPosition = 5;