diff --git a/datafusion/sqllogictest/src/engines/conversion.rs b/datafusion/sqllogictest/src/engines/conversion.rs
index d22b518234803..94002a3e976a9 100644
--- a/datafusion/sqllogictest/src/engines/conversion.rs
+++ b/datafusion/sqllogictest/src/engines/conversion.rs
@@ -96,7 +96,7 @@ pub(crate) fn arrow_decimal_to_str<T: DecimalType>(
 }
 
 #[cfg(feature = "postgres")]
-pub(crate) fn decimal_to_str(value: BigDecimal) -> String {
+pub(crate) fn decimal_to_str(value: &BigDecimal) -> String {
     value.to_plain_string()
 }
 
@@ -162,4 +162,11 @@ mod tests {
             "0.12345678901234567890123456789012345678"
         );
     }
+
+    #[cfg(feature = "postgres")]
+    #[test]
+    fn test_decimal_to_str() {
+        let value = BigDecimal::from_str("1.2300").unwrap();
+        assert_eq!(decimal_to_str(&value), "1.2300");
+    }
 }
diff --git a/datafusion/sqllogictest/src/engines/postgres_engine/mod.rs b/datafusion/sqllogictest/src/engines/postgres_engine/mod.rs
index 7ab5f1977d0e4..daa5acf165891 100644
--- a/datafusion/sqllogictest/src/engines/postgres_engine/mod.rs
+++ b/datafusion/sqllogictest/src/engines/postgres_engine/mod.rs
@@ -377,7 +377,7 @@ fn cell_to_string(row: &SimpleQueryRow, column_type: &Type, idx: usize) -> Strin
         (&Type::INT4, Some(value)) => value.parse::<i32>().unwrap().to_string(),
         (&Type::INT8, Some(value)) => value.parse::<i64>().unwrap().to_string(),
         (&Type::NUMERIC, Some(value)) => {
-            decimal_to_str(BigDecimal::from_str(value).unwrap())
+            decimal_to_str(&BigDecimal::from_str(value).unwrap())
         }
         // Parse date/time strings explicitly to avoid locale-specific formatting.
         (&Type::DATE, Some(value)) => NaiveDate::parse_from_str(value, "%Y-%m-%d")