diff --git a/src/main/kotlin/su/redume/models/Crypto.kt b/src/main/kotlin/su/redume/models/Crypto.kt
index 3d1f55c..dd5d35c 100644
--- a/src/main/kotlin/su/redume/models/Crypto.kt
+++ b/src/main/kotlin/su/redume/models/Crypto.kt
@@ -1,11 +1,10 @@
 package su.redume.models
 
 import org.jetbrains.exposed.sql.Table
-import org.jetbrains.exposed.sql.stringParam
 
 object Crypto : Table() {
-    val fromCurrecny = stringParam("fromCurrecny")
-    val convCurrency = stringParam("convCurrency")
+    val fromCurrecny = varchar("fromCurrecny", 3)
+    val convCurrency = varchar("convCurrency", 3)
     val rate = float("rate")
     val date = long("date")
 }
\ No newline at end of file
diff --git a/src/main/kotlin/su/redume/models/Fiat.kt b/src/main/kotlin/su/redume/models/Fiat.kt
index 5b17b19..dd385d2 100644
--- a/src/main/kotlin/su/redume/models/Fiat.kt
+++ b/src/main/kotlin/su/redume/models/Fiat.kt
@@ -1,11 +1,10 @@
 package su.redume.models
 
 import org.jetbrains.exposed.sql.Table
-import org.jetbrains.exposed.sql.stringParam
 
 object Fiat : Table() {
-    val fromCurrecny = stringParam("fromCurrecny")
-    val convCurrency = stringParam("convCurrency")
+    val fromCurrecny = varchar("fromCurrecny", 3)
+    val convCurrency = varchar("convCurrency", 3)
     val rate = float("rate")
     val date = long("date")
 }
\ No newline at end of file