diff --git a/jOOQ/src/main/java/org/jooq/impl/AlterTableImpl.java b/jOOQ/src/main/java/org/jooq/impl/AlterTableImpl.java
index 35c52cb4a7..527dd6c22f 100644
--- a/jOOQ/src/main/java/org/jooq/impl/AlterTableImpl.java
+++ b/jOOQ/src/main/java/org/jooq/impl/AlterTableImpl.java
@@ -1713,7 +1713,7 @@ implements
                      .sql(' ')
                      .visit(dropConstraint);
                 }
-                else if (dropConstraintType == PRIMARY_KEY && NO_SUPPORT_DROP_CONSTRAINT.contains(c.dialect()) || AbstractConstraint.NO_SUPPORT_NAMED_PK.contains(c.dialect())) {
+                else if (dropConstraintType == PRIMARY_KEY && (NO_SUPPORT_DROP_CONSTRAINT.contains(c.dialect()) || AbstractConstraint.NO_SUPPORT_NAMED_PK.contains(c.dialect()))) {
                     c.visit(K_DROP).sql(' ').visit(K_PRIMARY_KEY);
                 }
                 else {