diff --git a/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/codeGen/MarkersExtractor.kt b/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/codeGen/MarkersExtractor.kt
index 37f5e39476..ef883a33e9 100644
--- a/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/codeGen/MarkersExtractor.kt
+++ b/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/codeGen/MarkersExtractor.kt
@@ -8,9 +8,9 @@ import org.jetbrains.kotlinx.dataframe.impl.schema.getPropertiesOrder
 import org.jetbrains.kotlinx.dataframe.schema.ColumnSchema
 import kotlin.reflect.KClass
 import kotlin.reflect.KType
-import kotlin.reflect.full.declaredMemberProperties
 import kotlin.reflect.full.findAnnotation
 import kotlin.reflect.full.hasAnnotation
+import kotlin.reflect.full.memberProperties
 import kotlin.reflect.full.superclasses
 import kotlin.reflect.full.withNullability
 import kotlin.reflect.jvm.jvmErasure
@@ -54,7 +54,7 @@ internal object MarkersExtractor {
 
     private fun getFields(markerClass: KClass<*>, nullableProperties: Boolean): List<GeneratedField> {
         val order = getPropertiesOrder(markerClass)
-        return markerClass.declaredMemberProperties.sortedBy { order[it.name] ?: Int.MAX_VALUE }.mapIndexed { _, it ->
+        return markerClass.memberProperties.sortedBy { order[it.name] ?: Int.MAX_VALUE }.mapIndexed { _, it ->
             val fieldName = ValidFieldName.of(it.name)
             val columnName = it.findAnnotation<ColumnName>()?.name ?: fieldName.unquoted
             val type = it.returnType
diff --git a/core/src/test/kotlin/org/jetbrains/kotlinx/dataframe/api/convertTo.kt b/core/src/test/kotlin/org/jetbrains/kotlinx/dataframe/api/convertTo.kt
index 2fe735686d..fb9ffe3a4e 100644
--- a/core/src/test/kotlin/org/jetbrains/kotlinx/dataframe/api/convertTo.kt
+++ b/core/src/test/kotlin/org/jetbrains/kotlinx/dataframe/api/convertTo.kt
@@ -4,6 +4,7 @@ import io.kotest.assertions.throwables.shouldThrow
 import io.kotest.matchers.shouldBe
 import org.jetbrains.kotlinx.dataframe.AnyFrame
 import org.jetbrains.kotlinx.dataframe.DataFrame
+import org.jetbrains.kotlinx.dataframe.alsoDebug
 import org.jetbrains.kotlinx.dataframe.annotations.DataSchema
 import org.jetbrains.kotlinx.dataframe.exceptions.TypeConverterNotFoundException
 import org.junit.Test
@@ -239,9 +240,21 @@ class ConvertToTests {
             .alsoDebug("df5 after second convert:")
     }
 
-    private fun <T : DataFrame<*>> T.alsoDebug(println: String? = null): T = apply {
-        println?.let { println(it) }
-        print(borders = true, title = true, columnTypes = true, valueLimit = -1)
-        schema().print()
+    interface KeyValue<T> {
+        val key: String
+        val value: T
+    }
+
+    @DataSchema
+    interface MySchema : KeyValue<Int>
+
+    @Test
+    fun `Convert generic interface to itself`() {
+        val df = dataFrameOf("key", "value")(
+            "a", 1,
+            "b", 2,
+        ).alsoDebug()
+        val converted = df.convertTo<MySchema>().alsoDebug()
+        converted shouldBe df
     }
 }
diff --git a/plugins/symbol-processor/src/main/kotlin/org/jetbrains/dataframe/ksp/ExtensionsGenerator.kt b/plugins/symbol-processor/src/main/kotlin/org/jetbrains/dataframe/ksp/ExtensionsGenerator.kt
index ab819c3610..4ff61809fb 100644
--- a/plugins/symbol-processor/src/main/kotlin/org/jetbrains/dataframe/ksp/ExtensionsGenerator.kt
+++ b/plugins/symbol-processor/src/main/kotlin/org/jetbrains/dataframe/ksp/ExtensionsGenerator.kt
@@ -12,7 +12,6 @@ import com.google.devtools.ksp.symbol.KSClassifierReference
 import com.google.devtools.ksp.symbol.KSDeclaration
 import com.google.devtools.ksp.symbol.KSFile
 import com.google.devtools.ksp.symbol.KSName
-import com.google.devtools.ksp.symbol.KSPropertyDeclaration
 import com.google.devtools.ksp.symbol.KSTypeReference
 import com.google.devtools.ksp.symbol.KSValueArgument
 import com.google.devtools.ksp.symbol.Modifier
@@ -61,11 +60,10 @@ class ExtensionsGenerator(
         return when {
             isClassOrInterface() && effectivelyPublicOrInternal() -> {
                 DataSchemaDeclaration(
-                    this,
-                    declarations
-                        .filterIsInstance<KSPropertyDeclaration>()
+                    origin = this,
+                    properties = getAllProperties()
                         .map { KSAnnotatedWithType(it, it.simpleName, it.type) }
-                        .toList()
+                        .toList(),
                 )
             }
             else -> null
diff --git a/plugins/symbol-processor/src/test/kotlin/org/jetbrains/dataframe/ksp/DataFrameSymbolProcessorTest.kt b/plugins/symbol-processor/src/test/kotlin/org/jetbrains/dataframe/ksp/DataFrameSymbolProcessorTest.kt
index b24c2ebfee..1ae23e7066 100644
--- a/plugins/symbol-processor/src/test/kotlin/org/jetbrains/dataframe/ksp/DataFrameSymbolProcessorTest.kt
+++ b/plugins/symbol-processor/src/test/kotlin/org/jetbrains/dataframe/ksp/DataFrameSymbolProcessorTest.kt
@@ -706,6 +706,37 @@ class DataFrameSymbolProcessorTest {
         result.successfulCompilation shouldBe true
     }
 
+    @Test
+    fun `generic interface as supertype`() {
+        val result = KspCompilationTestRunner.compile(
+            TestCompilationParameters(
+                sources = listOf(
+                    SourceFile.kotlin(
+                        "MySources.kt",
+                        """
+                package org.example
+
+                $imports
+
+                interface KeyValue<T> {
+                    val key: String
+                    val value: T
+                }
+                
+                @DataSchema
+                interface MySchema : KeyValue<Int>
+
+
+                val ColumnsContainer<MySchema>.test1: DataColumn<String> get() = key
+                val DataRow<MySchema>.test2: Int get() = value
+                        """.trimIndent()
+                    )
+                )
+            )
+        )
+        result.successfulCompilation shouldBe true
+    }
+
     @Test
     fun `nested interface`() {
         val result = KspCompilationTestRunner.compile(