diff --git a/source/blender/gpu/shaders/gpu_shader_material.glsl b/source/blender/gpu/shaders/gpu_shader_material.glsl
index 9a238e979fa..c6b0a758208 100644
--- a/source/blender/gpu/shaders/gpu_shader_material.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_material.glsl
@@ -811,7 +811,7 @@ void mtex_rgb_mul(vec3 outcol, vec3 texcol, float fact, float facg, out vec3 inc
 	float facm;
 
 	fact *= facg;
-	facm = 1.0-facg;
+	facm = 1.0-fact;
 
 	incol = (facm + fact*texcol)*outcol;
 }
@@ -821,7 +821,7 @@ void mtex_rgb_screen(vec3 outcol, vec3 texcol, float fact, float facg, out vec3
 	float facm;
 
 	fact *= facg;
-	facm = 1.0-facg;
+	facm = 1.0-fact;
 
 	incol = vec3(1.0) - (vec3(facm) + fact*(vec3(1.0) - texcol))*(vec3(1.0) - outcol);
 }
@@ -831,7 +831,7 @@ void mtex_rgb_overlay(vec3 outcol, vec3 texcol, float fact, float facg, out vec3
 	float facm;
 
 	fact *= facg;
-	facm = 1.0-facg;
+	facm = 1.0-fact;
 
 	if(outcol.r < 0.5)
 		incol.r = outcol.r*(facm + 2.0*fact*texcol.r);
diff --git a/source/blender/render/intern/source/render_texture.c b/source/blender/render/intern/source/render_texture.c
index 2b189352a37..e3bfd535f11 100644
--- a/source/blender/render/intern/source/render_texture.c
+++ b/source/blender/render/intern/source/render_texture.c
@@ -1339,7 +1339,7 @@ void texture_rgb_blend(float in[3], const float tex[3], const float out[3], floa
 		
 	case MTEX_MUL:
 		fact*= facg;
-		facm= 1.0f-facg;
+		facm= 1.0f-fact;
 		in[0]= (facm+fact*tex[0])*out[0];
 		in[1]= (facm+fact*tex[1])*out[1];
 		in[2]= (facm+fact*tex[2])*out[2];
@@ -1347,7 +1347,7 @@ void texture_rgb_blend(float in[3], const float tex[3], const float out[3], floa
 
 	case MTEX_SCREEN:
 		fact*= facg;
-		facm= 1.0f-facg;
+		facm= 1.0f-fact;
 		in[0]= 1.0f - (facm+fact*(1.0f-tex[0])) * (1.0f-out[0]);
 		in[1]= 1.0f - (facm+fact*(1.0f-tex[1])) * (1.0f-out[1]);
 		in[2]= 1.0f - (facm+fact*(1.0f-tex[2])) * (1.0f-out[2]);
@@ -1355,7 +1355,7 @@ void texture_rgb_blend(float in[3], const float tex[3], const float out[3], floa
 
 	case MTEX_OVERLAY:
 		fact*= facg;
-		facm= 1.0f-facg;
+		facm= 1.0f-fact;
 		
 		if (out[0] < 0.5f)
 			in[0] = out[0] * (facm + 2.0f*fact*tex[0]);