diff --git a/code/renderergl1/tr_shader.c b/code/renderergl1/tr_shader.c
index 103d329f..4e2e6f6c 100644
--- a/code/renderergl1/tr_shader.c
+++ b/code/renderergl1/tr_shader.c
@@ -847,6 +847,8 @@ static qboolean ParseStage( shaderStage_t *stage, char **text )
 			{
 				vec3_t	color;
 
+				VectorClear( color );
+
 				ParseVector( text, 3, color );
 				stage->constantColor[0] = 255 * color[0];
 				stage->constantColor[1] = 255 * color[1];
diff --git a/code/renderergl2/tr_shader.c b/code/renderergl2/tr_shader.c
index cbb01121..d5b053de 100644
--- a/code/renderergl2/tr_shader.c
+++ b/code/renderergl2/tr_shader.c
@@ -1091,6 +1091,8 @@ static qboolean ParseStage( shaderStage_t *stage, char **text )
 			{
 				vec3_t	color;
 
+				VectorClear( color );
+
 				ParseVector( text, 3, color );
 				stage->constantColor[0] = 255 * color[0];
 				stage->constantColor[1] = 255 * color[1];