diff --git a/src/compiler/nir/nir_opt_copy_prop_vars.c b/src/compiler/nir/nir_opt_copy_prop_vars.c
index 83680b6139d..e59cd18b98d 100644
--- a/src/compiler/nir/nir_opt_copy_prop_vars.c
+++ b/src/compiler/nir/nir_opt_copy_prop_vars.c
@@ -64,8 +64,8 @@ struct value {
    bool is_ssa;
    union {
       struct {
-         nir_ssa_def *def[4];
-         uint8_t component[4];
+         nir_ssa_def *def[NIR_MAX_VEC_COMPONENTS];
+         uint8_t component[NIR_MAX_VEC_COMPONENTS];
       } ssa;
       nir_deref_instr *deref;
    };
@@ -394,7 +394,7 @@ value_set_from_value(struct value *value, const struct value *from,
          memset(&value->ssa, 0, sizeof(value->ssa));
       value->is_ssa = true;
       /* Only overwrite the written components */
-      for (unsigned i = 0; i < 4; i++) {
+      for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++) {
          if (write_mask & (1 << i)) {
             value->ssa.def[i] = from->ssa.def[i];
             value->ssa.component[i] = from->ssa.component[i];
@@ -408,7 +408,7 @@ value_set_from_value(struct value *value, const struct value *from,
 }
 
 /* Do a "load" from an SSA-based entry return it in "value" as a value with a
- * single SSA def.  Because an entry could reference up to 4 different SSA
+ * single SSA def.  Because an entry could reference multiple different SSA
  * defs, a vecN operation may be inserted to combine them into a single SSA
  * def before handing it back to the caller.  If the load instruction is no
  * longer needed, it is removed and nir_instr::block is set to NULL.  (It is
@@ -831,7 +831,9 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
             /* Not handled yet.  Writing into an element of 'dst' invalidates
              * any related entries in copies.
              */
-            kill_aliases(copies, nir_deref_instr_parent(dst), 0xf);
+            nir_deref_instr *vector = nir_deref_instr_parent(dst);
+            unsigned vector_components = glsl_get_vector_elements(vector->type);
+            kill_aliases(copies, vector, (1 << vector_components) - 1);
          } else {
             struct value value = {0};
             value_set_ssa_components(&value, intrin->src[1].ssa,
@@ -857,12 +859,18 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
             continue;
          }
 
+         /* The copy_deref intrinsic doesn't keep track of num_components, so
+          * get it ourselves.
+          */
+         unsigned num_components = glsl_get_vector_elements(dst->type);
+         unsigned full_mask = (1 << num_components) - 1;
+
          if (is_array_deref_of_vector(src) || is_array_deref_of_vector(dst)) {
             /* Cases not handled yet.  Writing into an element of 'dst'
              * invalidates any related entries in copies.  Reading from 'src'
              * doesn't invalidate anything, so no action needed for it.
              */
-            kill_aliases(copies, dst, 0xf);
+            kill_aliases(copies, dst, full_mask);
             break;
          }
 
@@ -872,7 +880,7 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
          if (try_load_from_entry(state, src_entry, b, intrin, src, &value)) {
             /* If load works, intrin (the copy_deref) is removed. */
             if (value.is_ssa) {
-               nir_store_deref(b, dst, value.ssa.def[0], 0xf);
+               nir_store_deref(b, dst, value.ssa.def[0], full_mask);
             } else {
                /* If this would be a no-op self-copy, don't bother. */
                if (nir_compare_derefs(value.deref, dst) & nir_derefs_equal_bit)
@@ -894,8 +902,8 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
          }
 
          struct copy_entry *dst_entry =
-            get_entry_and_kill_aliases(copies, dst, 0xf);
-         value_set_from_value(&dst_entry->src, &value, 0xf);
+            get_entry_and_kill_aliases(copies, dst, full_mask);
+         value_set_from_value(&dst_entry->src, &value, full_mask);
          break;
       }
 
@@ -910,7 +918,11 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
       case nir_intrinsic_deref_atomic_exchange:
       case nir_intrinsic_deref_atomic_comp_swap:
          if (debug) dump_instr(instr);
-         kill_aliases(copies, nir_src_as_deref(intrin->src[0]), 0xf);
+
+         nir_deref_instr *dst = nir_src_as_deref(intrin->src[0]);
+         unsigned num_components = glsl_get_vector_elements(dst->type);
+         unsigned full_mask = (1 << num_components) - 1;
+         kill_aliases(copies, dst, full_mask);
          break;
 
       default: