diff --git a/cranelift/codegen/shared/src/constants.rs b/cranelift/codegen/shared/src/constants.rs
index b3f1377856..e052cc3567 100644
--- a/cranelift/codegen/shared/src/constants.rs
+++ b/cranelift/codegen/shared/src/constants.rs
@@ -20,11 +20,3 @@ pub const REFERENCE_BASE: u8 = 0x7E;
 
 /// Start of the 2-lane vector types.
 pub const VECTOR_BASE: u8 = 0x80;
-
-// Some constants about register classes and types.
-
-/// Guaranteed maximum number of top-level register classes with pressure tracking in any ISA.
-pub const MAX_TRACKED_TOP_RCS: usize = 4;
-
-/// Guaranteed maximum number of register classes in any ISA.
-pub const MAX_NUM_REG_CLASSES: usize = 32;