diff --git a/lib/DBIx/Class/Helper/ResultSet/DateMethods1.pm b/lib/DBIx/Class/Helper/ResultSet/DateMethods1.pm
index 51e76d4..e16fad9 100644
--- a/lib/DBIx/Class/Helper/ResultSet/DateMethods1.pm
+++ b/lib/DBIx/Class/Helper/ResultSet/DateMethods1.pm
@@ -287,7 +287,8 @@ sub _introspector {
 
             my $sql = delete $date_sql->[0];
 
-            $sql = 'TO_TIMESTAMP(?)' if $sql eq '?';
+            $sql = "TO_TIMESTAMP($sql)"
+                if $part =~ /second|minute|hour/;
             return [
                "EXTRACT($part_map{$part} FROM $sql)", @$date_sql
             ]
diff --git a/t/resultset/date-methods-1.t b/t/resultset/date-methods-1.t
index 0b59696..7f1bc53 100644
--- a/t/resultset/date-methods-1.t
+++ b/t/resultset/date-methods-1.t
@@ -787,12 +787,12 @@ run_me(Oracle => {
       second => \[ '("a_date" + NUMTODSINTERVAL(?, ?))', 5, 'SECOND' ],
    },
 
-   pluck_sql_prefix => \[ 'EXTRACT(SECOND FROM "me"."a_date")' ],
+   pluck_sql_prefix => \[ 'EXTRACT(SECOND FROM TO_TIMESTAMP("me"."a_date"))' ],
 
    pluck_sql_by_part => {
-      second       => \[ 'EXTRACT(SECOND FROM "a_date")' ],
-      minute       => \[ 'EXTRACT(MINUTE FROM "a_date")' ],
-      hour         => \[ 'EXTRACT(HOUR FROM "a_date")' ],
+      second       => \[ 'EXTRACT(SECOND FROM TO_TIMESTAMP("a_date"))' ],
+      minute       => \[ 'EXTRACT(MINUTE FROM TO_TIMESTAMP("a_date"))' ],
+      hour         => \[ 'EXTRACT(HOUR FROM TO_TIMESTAMP("a_date"))' ],
       day_of_month => \[ 'EXTRACT(DAY FROM "a_date")' ],
       month        => \[ 'EXTRACT(MONTH FROM "a_date")' ],
       year         => \[ 'EXTRACT(YEAR FROM "a_date")' ],