diff --git a/src/imagination/pco/pco.c b/src/imagination/pco/pco.c
index edbfe1f8b96..d39453cf48a 100644
--- a/src/imagination/pco/pco.c
+++ b/src/imagination/pco/pco.c
@@ -305,10 +305,14 @@ pco_precomp_data pco_get_precomp_data(pco_shader *shader)
 {
    assert(pco_shader_binary_size(shader));
 
+   unsigned size_dwords = pco_shader_binary_size(shader) / sizeof(uint32_t);
+   assert(size_dwords <= UINT16_MAX);
+
    return (pco_precomp_data){
       .temps = shader->data.common.temps,
       .vtxins = shader->data.common.vtxins,
       .coeffs = shader->data.common.coeffs,
       .shareds = shader->data.common.shareds,
+      .size_dwords = size_dwords,
    };
 }
diff --git a/src/imagination/pco/pco_data.h b/src/imagination/pco/pco_data.h
index e694242bb7f..1fbcf007c5e 100644
--- a/src/imagination/pco/pco_data.h
+++ b/src/imagination/pco/pco_data.h
@@ -241,7 +241,11 @@ typedef struct PACKED _pco_precomp_data {
    uint16_t coeffs : 12;
    uint16_t shareds : 12;
 
-   uint8_t pad[3];
+   uint16_t size_dwords;
+
+   uint8_t pad[1];
+
+   uint32_t binary[];
 } pco_precomp_data;
 static_assert(sizeof(pco_precomp_data) == 8, "sizeof(pco_precomp_data) != 8");