diff --git a/src/video_core/host_shaders/astc_decoder.comp b/src/video_core/host_shaders/astc_decoder.comp
index a33c916aca..547cd881ff 100644
--- a/src/video_core/host_shaders/astc_decoder.comp
+++ b/src/video_core/host_shaders/astc_decoder.comp
@@ -79,7 +79,7 @@ int color_bitsread = 0;
 #define VECTOR_ARRAY_SIZE DIVCEIL(ARRAY_NUM_ELEMENTS * 2, 4)
 uvec4 result_vector[VECTOR_ARRAY_SIZE];
 
-uint result_index = 0;
+int result_index = 0;
 uint result_vector_max_index;
 bool result_limit_reached = false;
 
@@ -122,8 +122,8 @@ void ResultEmplaceBack(EncodingData val) {
         result_limit_reached = true;
         return;
     }
-    const uint array_index = result_index / 4u;
-    const uint vector_index = result_index % 4u;
+    const uint array_index = result_index / 4;
+    const uint vector_index = result_index % 4;
     result_vector[array_index][vector_index] = val.data;
     ++result_index;
 }