diff --git a/include/render/vulkan.h b/include/render/vulkan.h
index 651106042..c3fb6b2bf 100644
--- a/include/render/vulkan.h
+++ b/include/render/vulkan.h
@@ -339,6 +339,10 @@ struct wlr_vk_vert_pcr_data {
 	float uv_size[2];
 };
 
+struct wlr_vk_frag_texture_pcr_data {
+	float alpha;
+};
+
 struct wlr_vk_frag_output_pcr_data {
 	float matrix[4][4]; // only a 3x3 subset is used
 	float luminance_multiplier;
diff --git a/render/vulkan/pass.c b/render/vulkan/pass.c
index 95fbd319e..49435b0e8 100644
--- a/render/vulkan/pass.c
+++ b/render/vulkan/pass.c
@@ -816,6 +816,10 @@ static void render_pass_add_texture(struct wlr_render_pass *wlr_pass,
 		return;
 	}
 
+	struct wlr_vk_frag_texture_pcr_data frag_pcr_data = {
+		.alpha = alpha,
+	};
+
 	bind_pipeline(pass, pipe->vk);
 
 	vkCmdBindDescriptorSets(cb, VK_PIPELINE_BIND_POINT_GRAPHICS,
@@ -824,8 +828,8 @@ static void render_pass_add_texture(struct wlr_render_pass *wlr_pass,
 	vkCmdPushConstants(cb, pipe->layout->vk,
 		VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(vert_pcr_data), &vert_pcr_data);
 	vkCmdPushConstants(cb, pipe->layout->vk,
-		VK_SHADER_STAGE_FRAGMENT_BIT, sizeof(vert_pcr_data), sizeof(float),
-		&alpha);
+		VK_SHADER_STAGE_FRAGMENT_BIT, sizeof(vert_pcr_data),
+		sizeof(frag_pcr_data), &frag_pcr_data);
 
 	pixman_region32_t clip;
 	get_clip_region(pass, options->clip, &clip);
diff --git a/render/vulkan/shaders/texture.frag b/render/vulkan/shaders/texture.frag
index 84b7678e4..58ac59fea 100644
--- a/render/vulkan/shaders/texture.frag
+++ b/render/vulkan/shaders/texture.frag
@@ -5,6 +5,7 @@ layout(set = 0, binding = 0) uniform sampler2D tex;
 layout(location = 0) in vec2 uv;
 layout(location = 0) out vec4 out_color;
 
+// struct wlr_vk_frag_texture_pcr_data
 layout(push_constant) uniform UBO {
 	layout(offset = 80) float alpha;
 } data;