diff --git a/jOOQ/src/main/java/org/jooq/impl/Tools.java b/jOOQ/src/main/java/org/jooq/impl/Tools.java
index c16267a5e0..a71d6c8598 100644
--- a/jOOQ/src/main/java/org/jooq/impl/Tools.java
+++ b/jOOQ/src/main/java/org/jooq/impl/Tools.java
@@ -123,6 +123,7 @@ import static org.jooq.impl.Keywords.K_START_WITH;
 import static org.jooq.impl.Keywords.K_THEN;
 import static org.jooq.impl.Keywords.K_THROW;
 import static org.jooq.impl.Keywords.K_WHEN;
+import static org.jooq.impl.SQLDataType.VARCHAR;
 import static org.jooq.impl.Tools.DataKey.DATA_BLOCK_NESTING;
 import static org.jooq.tools.reflect.Reflect.accessible;
 
@@ -3879,6 +3880,17 @@ final class Tools {
             }
         }
 
+        // [#5807] These databases cannot use the DataType.getCastTypeName() (which is simply char in this case)
+        if (type.getType() == UUID.class) {
+            switch (ctx.family()) {
+                case MARIADB:
+                case MYSQL: {
+                    toSQLDDLTypeDeclaration(ctx, VARCHAR(36));
+                    return;
+                }
+            }
+        }
+
         if (type.hasLength()) {
 
             // [#6289] Some databases don't support lengths on binary types