diff --git a/src/repr/src/relation.rs b/src/repr/src/relation.rs
index d18df7f372843..9e7fbf5de6dca 100644
--- a/src/repr/src/relation.rs
+++ b/src/repr/src/relation.rs
@@ -237,7 +237,7 @@ impl RelationType {
             if col1.nullable && !col2.nullable {
                 return false;
             }
-            if col1.scalar_type != col2.scalar_type {
+            if !col1.scalar_type.base_eq(&col2.scalar_type) {
                 return false;
             }
         }
diff --git a/test/sqllogictest/with_mutually_recursive.slt b/test/sqllogictest/with_mutually_recursive.slt
index 3c3cc88e644ae..c9881417c2b67 100644
--- a/test/sqllogictest/with_mutually_recursive.slt
+++ b/test/sqllogictest/with_mutually_recursive.slt
@@ -607,3 +607,14 @@ statement error db error: ERROR: Invalid WITH MUTUALLY RECURSIVE recursion limit
 WITH MUTUALLY RECURSIVE (RECURSION LIMIT 0)
   cnt (i int) AS (SELECT 1 AS i UNION SELECT i+1 FROM cnt)
 SELECT * FROM cnt;
+
+# Test WMR coercion
+statement ok
+CREATE TABLE y (a BIGINT);
+
+query I
+WITH MUTUALLY RECURSIVE
+    bar(x NUMERIC) as (SELECT sum(a) FROM y)
+SELECT * FROM bar
+----
+NULL