diff --git a/Source/gs/GSH_Direct3D9/GSH_Direct3D9_Shader.cpp b/Source/gs/GSH_Direct3D9/GSH_Direct3D9_Shader.cpp
index b9b1c1fee1..35e6016ca4 100644
--- a/Source/gs/GSH_Direct3D9/GSH_Direct3D9_Shader.cpp
+++ b/Source/gs/GSH_Direct3D9/GSH_Direct3D9_Shader.cpp
@@ -140,6 +140,7 @@ Nuanceur::CShaderBuilder CGSH_Direct3D9::GeneratePixelShader(SHADERCAPS caps)
 				                     NewFloat4(b, 0, 0, 0, 0), NewFloat4(b, 1, 1, 1, 1));
 				break;
 			case TEX0_FUNCTION_DECAL:
+				//TODO: Replace A with fragment's A if tex has no alpha channel.
 				break;
 			default:
 				assert(0);
diff --git a/Source/gs/GSH_OpenGL/GSH_OpenGL_Shader.cpp b/Source/gs/GSH_OpenGL/GSH_OpenGL_Shader.cpp
index a87c41ac01..ca8148cdac 100644
--- a/Source/gs/GSH_OpenGL/GSH_OpenGL_Shader.cpp
+++ b/Source/gs/GSH_OpenGL/GSH_OpenGL_Shader.cpp
@@ -316,6 +316,10 @@ Framework::OpenGl::CShader CGSH_OpenGL::GenerateFragmentShader(const SHADERCAPS&
 			}
 			break;
 		case TEX0_FUNCTION_DECAL:
+			if(!caps.texHasAlpha)
+			{
+				shaderBuilder << "	textureColor.a = v_color.a;" << std::endl;
+			}
 			break;
 		case TEX0_FUNCTION_HIGHLIGHT:
 			shaderBuilder << "	textureColor.rgb = clamp(textureColor.rgb * v_color.rgb * 2.0, 0.0, 1.0) + v_color.aaa;" << std::endl;
diff --git a/Source/gs/GSH_Vulkan/GSH_VulkanDrawDesktop.cpp b/Source/gs/GSH_Vulkan/GSH_VulkanDrawDesktop.cpp
index 744d3ec377..bf01622053 100644
--- a/Source/gs/GSH_Vulkan/GSH_VulkanDrawDesktop.cpp
+++ b/Source/gs/GSH_Vulkan/GSH_VulkanDrawDesktop.cpp
@@ -639,7 +639,10 @@ Framework::Vulkan::CShaderModule CDrawDesktop::CreateFragmentShader(const PIPELI
 				}
 				break;
 			case CGSHandler::TEX0_FUNCTION_DECAL:
-				//Nothing to do
+				if(!caps.textureHasAlpha)
+				{
+					textureColor = NewFloat4(textureColor->xyz(), inputColor->w());
+				}
 				break;
 			case CGSHandler::TEX0_FUNCTION_HIGHLIGHT:
 			{
diff --git a/Source/gs/GSH_Vulkan/GSH_VulkanDrawMobile.cpp b/Source/gs/GSH_Vulkan/GSH_VulkanDrawMobile.cpp
index 23b60e2fc7..df388fd56f 100644
--- a/Source/gs/GSH_Vulkan/GSH_VulkanDrawMobile.cpp
+++ b/Source/gs/GSH_Vulkan/GSH_VulkanDrawMobile.cpp
@@ -979,7 +979,10 @@ Framework::Vulkan::CShaderModule CDrawMobile::CreateDrawFragmentShader(const PIP
 				}
 				break;
 			case CGSHandler::TEX0_FUNCTION_DECAL:
-				//Nothing to do
+				if(!caps.textureHasAlpha)
+				{
+					textureColor = NewFloat4(textureColor->xyz(), inputColor->w());
+				}
 				break;
 			case CGSHandler::TEX0_FUNCTION_HIGHLIGHT:
 			{