diff --git a/shaders/lib/climate_settings.glsl b/shaders/lib/climate_settings.glsl
index 6ea4aef..768623d 100644
--- a/shaders/lib/climate_settings.glsl
+++ b/shaders/lib/climate_settings.glsl
@@ -52,7 +52,7 @@
 	    	int SeasonLength = Season_Length; 
 
 			// loop the year. multiply the season length by the 4 seasons to create a years time.
-	    	float YearLoop = mod(worldDay & 0xFFFF + Start_Season * SeasonLength, SeasonLength * 4);
+	    	float YearLoop = mod((worldDay & 0xFFFF) + Start_Season * SeasonLength, SeasonLength * 4);
 
 	    	// the time schedule for each season
 	    	float SummerTime = clamp(YearLoop                  ,0, SeasonLength) / SeasonLength;
@@ -95,7 +95,7 @@
 	    	int SeasonLength = 1; 
 
 			// loop the year. multiply the season length by the 4 seasons to create a years time.
-	    	float YearLoop = mod(worldDay & 0xFFFF + SeasonLength, SeasonLength * 4);
+	    	float YearLoop = mod((worldDay & 0xFFFF) + SeasonLength, SeasonLength * 4);
 
 	    	// the time schedule for each season
 	    	float SummerTime = clamp(YearLoop                  ,0, SeasonLength) / SeasonLength;