diff --git a/compiler/rustc_query_system/src/dep_graph/dep_node.rs b/compiler/rustc_query_system/src/dep_graph/dep_node.rs
index 9c196093f23..5f1a03502a7 100644
--- a/compiler/rustc_query_system/src/dep_graph/dep_node.rs
+++ b/compiler/rustc_query_system/src/dep_graph/dep_node.rs
@@ -76,8 +76,6 @@ impl DepKind {
     }
 }
 
-static_assert_size!(DepKind, 2);
-
 pub fn default_dep_kind_debug(kind: DepKind, f: &mut fmt::Formatter<'_>) -> fmt::Result {
     f.debug_struct("DepKind").field("variant", &kind.variant).finish()
 }
@@ -97,15 +95,6 @@ pub struct DepNode {
     pub hash: PackedFingerprint,
 }
 
-// We keep a lot of `DepNode`s in memory during compilation. It's not
-// required that their size stay the same, but we don't want to change
-// it inadvertently. This assert just ensures we're aware of any change.
-#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
-static_assert_size!(DepNode, 18);
-
-#[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
-static_assert_size!(DepNode, 24);
-
 impl DepNode {
     /// Creates a new, parameterless DepNode. This method will assert
     /// that the DepNode corresponding to the given DepKind actually
@@ -316,3 +305,17 @@ unsafe impl StableOrd for WorkProductId {
     // Fingerprint can use unstable (just a tuple of `u64`s), so WorkProductId can as well
     const CAN_USE_UNSTABLE_SORT: bool = true;
 }
+
+// Some types are used a lot. Make sure they don't unintentionally get bigger.
+#[cfg(target_pointer_width = "64")]
+mod size_asserts {
+    use super::*;
+    use rustc_data_structures::static_assert_size;
+    // tidy-alphabetical-start
+    static_assert_size!(DepKind, 2);
+    #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+    static_assert_size!(DepNode, 18);
+    #[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
+    static_assert_size!(DepNode, 24);
+    // tidy-alphabetical-end
+}
diff --git a/compiler/rustc_query_system/src/dep_graph/graph.rs b/compiler/rustc_query_system/src/dep_graph/graph.rs
index 3e4e2e919fb..07543b79f97 100644
--- a/compiler/rustc_query_system/src/dep_graph/graph.rs
+++ b/compiler/rustc_query_system/src/dep_graph/graph.rs
@@ -41,6 +41,11 @@ rustc_index::newtype_index! {
     pub struct DepNodeIndex {}
 }
 
+// We store a large collection of these in `prev_index_to_index` during
+// non-full incremental builds, and want to ensure that the element size
+// doesn't inadvertently increase.
+rustc_data_structures::static_assert_size!(Option<DepNodeIndex>, 4);
+
 impl DepNodeIndex {
     const SINGLETON_DEPENDENCYLESS_ANON_NODE: DepNodeIndex = DepNodeIndex::ZERO;
     pub const FOREVER_RED_NODE: DepNodeIndex = DepNodeIndex::from_u32(1);
@@ -1107,11 +1112,6 @@ impl<D: Deps> CurrentDepGraph<D> {
             Err(_) => None,
         };
 
-        // We store a large collection of these in `prev_index_to_index` during
-        // non-full incremental builds, and want to ensure that the element size
-        // doesn't inadvertently increase.
-        static_assert_size!(Option<DepNodeIndex>, 4);
-
         let new_node_count_estimate = 102 * prev_graph_node_count / 100 + 200;
 
         CurrentDepGraph {
diff --git a/compiler/rustc_query_system/src/lib.rs b/compiler/rustc_query_system/src/lib.rs
index e1743b147d4..6ed0b1b1d9d 100644
--- a/compiler/rustc_query_system/src/lib.rs
+++ b/compiler/rustc_query_system/src/lib.rs
@@ -7,8 +7,6 @@
 
 #[macro_use]
 extern crate tracing;
-#[macro_use]
-extern crate rustc_data_structures;
 
 pub mod cache;
 pub mod dep_graph;