diff --git a/resources/shaders/glsl/blur_horizontal.glsl b/resources/shaders/glsl/blur_horizontal.glsl
index 9baac55a0..4cbd1643a 100644
--- a/resources/shaders/glsl/blur_horizontal.glsl
+++ b/resources/shaders/glsl/blur_horizontal.glsl
@@ -105,7 +105,9 @@ void main()
     float sampleWeights4 = 0.024067905;
     float sampleWeights5 = 0.0021112196;
 
-    vec4 color = COMPAT_TEXTURE(Source, texcoord) * sampleWeights1;
+    // Alpha is handled differently depending on the graphics drivers, so set it explicitly to 1.0.
+    vec4 color = COMPAT_TEXTURE(Source, texcoord);
+    color = vec4(color.rgb, 1.0) * sampleWeights1;
 
 // unroll the loop
         color += COMPAT_TEXTURE(Source, texcoord + vec2(sampleOffsets2* HW * PIXEL_SIZE.x, 0.0)) * sampleWeights2;
diff --git a/resources/shaders/glsl/blur_vertical.glsl b/resources/shaders/glsl/blur_vertical.glsl
index 3348d94f8..2810c244e 100644
--- a/resources/shaders/glsl/blur_vertical.glsl
+++ b/resources/shaders/glsl/blur_vertical.glsl
@@ -106,7 +106,9 @@ void main()
     float sampleWeights4 = 0.024067905;
     float sampleWeights5 = 0.0021112196;
 
-    vec4 color = COMPAT_TEXTURE(Source, texcoord) * sampleWeights1;
+    // Alpha is handled differently depending on the graphics drivers, so set it explicitly to 1.0.
+    vec4 color = COMPAT_TEXTURE(Source, texcoord);
+    color = vec4(color.rgb, 1.0) * sampleWeights1;
 
 // unroll the loop
         color += COMPAT_TEXTURE(Source, texcoord + vec2(0.0, sampleOffsets2* VW * PIXEL_SIZE.y)) * sampleWeights2;
diff --git a/resources/shaders/glsl/dim.glsl b/resources/shaders/glsl/dim.glsl
index d3b5781c4..efcc1651b 100644
--- a/resources/shaders/glsl/dim.glsl
+++ b/resources/shaders/glsl/dim.glsl
@@ -28,7 +28,9 @@ varying vec2 vTexCoord;
 void main()
 {
     vec4 dimColor = vec4(dimValue, dimValue, dimValue, 1.0);
-    vec4 color = texture2D(myTexture, vTexCoord) * dimColor;
+    vec4 color = texture2D(myTexture, vTexCoord);
+    // Alpha is handled differently depending on the graphics drivers, so set it explicitly to 1.0.
+    color = vec4(color.rgb, 1.0) * dimColor;
 
     gl_FragColor = color;
 }