diff --git a/src/mir/builder/control_flow/joinir/merge/instruction_rewriter.rs b/src/mir/builder/control_flow/joinir/merge/instruction_rewriter.rs
index 28761c27..c32e0716 100644
--- a/src/mir/builder/control_flow/joinir/merge/instruction_rewriter.rs
+++ b/src/mir/builder/control_flow/joinir/merge/instruction_rewriter.rs
@@ -108,7 +108,8 @@ fn scan_blocks(
     debug: bool,
 ) -> Result<RewritePlan, String> {
     let trace = trace::trace();
-    let verbose = debug || crate::config::env::joinir_dev_enabled();
+    // Only verbose if explicitly requested via debug flag (not env var - causes test failures)
+    let verbose = debug;
     macro_rules! log {
         ($enabled:expr, $($arg:tt)*) => {
             trace.stderr_if(&format!($($arg)*), $enabled);