diff --git a/code/renderergl2/tr_bsp.c b/code/renderergl2/tr_bsp.c
index c335ea5a..a4f47cb8 100644
--- a/code/renderergl2/tr_bsp.c
+++ b/code/renderergl2/tr_bsp.c
@@ -386,7 +386,7 @@ static	void R_LoadLightmaps( lump_t *l, lump_t *surfs ) {
 			{
 				if (hdrLightmap)
 				{
-					float color[3];
+					vec4_t color;
 
 #if 0 // HDRFILE_RGBE
 					float exponent = exp2(buf_p[j*4+3] - 128);
@@ -401,6 +401,8 @@ static	void R_LoadLightmaps( lump_t *l, lump_t *surfs ) {
 					color[1] = LittleFloat(color[1]);
 					color[2] = LittleFloat(color[2]);
 #endif
+					color[3] = 1.0f;
+
 					R_ColorShiftLightingFloats(color, color, 1.0f/255.0f);
 
 					if (glRefConfig.textureFloat && glRefConfig.halfFloatPixel && r_floatLightmap->integer)
@@ -410,7 +412,7 @@ static	void R_LoadLightmaps( lump_t *l, lump_t *surfs ) {
 				}
 				else if (glRefConfig.textureFloat && glRefConfig.halfFloatPixel && r_floatLightmap->integer) 
 				{
-					float color[3];
+					vec4_t color;
 
 					//hack: convert LDR lightmap to HDR one
 					color[0] = MAX(buf_p[j*3+0], 0.499f);
@@ -426,6 +428,7 @@ static	void R_LoadLightmaps( lump_t *l, lump_t *surfs ) {
 						color[1] = avg;
 						color[2] = avg;
 					}
+					color[3] = 1.0f;
 
 					R_ColorShiftLightingFloats(color, color, 1.0f/255.0f);