diff --git a/compiler/rustc_mir_transform/src/deduplicate_blocks.rs b/compiler/rustc_mir_transform/src/deduplicate_blocks.rs
index 909116a77f54f..3b1c72c47488c 100644
--- a/compiler/rustc_mir_transform/src/deduplicate_blocks.rs
+++ b/compiler/rustc_mir_transform/src/deduplicate_blocks.rs
@@ -16,7 +16,7 @@ pub struct DeduplicateBlocks;
 
 impl<'tcx> MirPass<'tcx> for DeduplicateBlocks {
     fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
-        sess.mir_opt_level() >= 4
+        sess.mir_opt_level() >= 1
     }
 
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
@@ -72,13 +72,6 @@ fn find_duplicates(body: &Body<'_>) -> FxHashMap<BasicBlock, BasicBlock> {
     // with replacement bb3.
     // When the duplicates are removed, we will end up with only bb3.
     for (bb, bbd) in body.basic_blocks.iter_enumerated().rev().filter(|(_, bbd)| !bbd.is_cleanup) {
-        // Basic blocks can get really big, so to avoid checking for duplicates in basic blocks
-        // that are unlikely to have duplicates, we stop early. The early bail number has been
-        // found experimentally by eprintln while compiling the crates in the rustc-perf suite.
-        if bbd.statements.len() > 10 {
-            continue;
-        }
-
         let to_hash = BasicBlockHashable { basic_block_data: bbd };
         let entry = same_hashes.entry(to_hash);
         match entry {