diff --git a/QtMeshViewer/Resources/fshader.glsl b/QtMeshViewer/Resources/fshader.glsl
index ec72252..4e5d7be 100644
--- a/QtMeshViewer/Resources/fshader.glsl
+++ b/QtMeshViewer/Resources/fshader.glsl
@@ -39,7 +39,7 @@ void main()
 		vec3 surfaceToLight;
 		float attenuation;
 		// directional light
-		if(light.position.w == 0)
+		if(light.position.w == 0.0f)
 		{
 			surfaceToLight = normalize(light.position.xyz);
 		}
@@ -65,9 +65,12 @@ void main()
 		float specularCoefficient = 0.0;
 		if(diffuseCoefficient > 0.0)
 			specularCoefficient = pow(max(0.0, dot(surfaceToCamera, reflect(-surfaceToLight, normalWorld))), materialShininess);
+		vec3 specColor;
 		if(b_specular)
-			materialSpecularColor = vec3(surfaceColor.a);
-		vec3 specular = specularCoefficient * materialSpecularColor * light.intensities;
+			specColor = vec3(surfaceColor.a);
+		else
+			specColor = materialSpecularColor;
+		vec3 specular = specularCoefficient * specColor * light.intensities;
 
 		// linear color before gamma correction)
 		vec3 linearColor = ambient + attenuation * (diffuse + specular);