diff --git a/src/main/kotlin/org/virtuslab/pulumikotlin/codegen/step2intermediate/PulumiName.kt b/src/main/kotlin/org/virtuslab/pulumikotlin/codegen/step2intermediate/PulumiName.kt
index b2d847a55..c6a4409aa 100644
--- a/src/main/kotlin/org/virtuslab/pulumikotlin/codegen/step2intermediate/PulumiName.kt
+++ b/src/main/kotlin/org/virtuslab/pulumikotlin/codegen/step2intermediate/PulumiName.kt
@@ -204,6 +204,7 @@ data class PulumiName(
     }
 
     fun toResourceFunctionName(namingFlags: NamingFlags): String {
+        require(namingFlags.language == Kotlin)
         val resourceName = toResourceName(namingFlags)
         val numberOfCaps = resourceName.takeWhile { it.isUpperCase() || it.isDigit() }.count()
         return if (numberOfCaps == resourceName.length) {
diff --git a/src/test/kotlin/org/virtuslab/pulumikotlin/codegen/step2intermediate/PulumiNameTest.kt b/src/test/kotlin/org/virtuslab/pulumikotlin/codegen/step2intermediate/PulumiNameTest.kt
index b1fc5db0b..566effbd2 100644
--- a/src/test/kotlin/org/virtuslab/pulumikotlin/codegen/step2intermediate/PulumiNameTest.kt
+++ b/src/test/kotlin/org/virtuslab/pulumikotlin/codegen/step2intermediate/PulumiNameTest.kt
@@ -564,13 +564,28 @@ internal class PulumiNameTest {
 
         // when
         val pulumiName = PulumiName.from(token, namingConfiguration)
-        val namingFlags = NamingFlags(Root, Resource, Input, Java)
+        val namingFlags = NamingFlags(Root, Resource, Input, Kotlin)
         val resourceFunctionName = pulumiName.toResourceFunctionName(namingFlags)
 
         // then
         assertEquals("organizationPolicy", resourceFunctionName)
     }
 
+    @Test
+    fun `a resource function name starting with a two-letter acronym is decapitalized correctly`() {
+        // given
+        val token = "provider:module:VMwareCluster"
+        val namingConfiguration = PulumiNamingConfiguration.create(providerName = "provider")
+
+        // when
+        val pulumiName = PulumiName.from(token, namingConfiguration)
+        val namingFlags = NamingFlags(Root, Resource, Input, Kotlin)
+        val resourceFunctionName = pulumiName.toResourceFunctionName(namingFlags)
+
+        // then
+        assertEquals("vMwareCluster", resourceFunctionName)
+    }
+    
     @Test
     fun `a resource function name starting with a three-letter acronym is decapitalized correctly`() {
         // given
@@ -579,7 +594,7 @@ internal class PulumiNameTest {
 
         // when
         val pulumiName = PulumiName.from(token, namingConfiguration)
-        val namingFlags = NamingFlags(Root, Resource, Input, Java)
+        val namingFlags = NamingFlags(Root, Resource, Input, Kotlin)
         val resourceFunctionName = pulumiName.toResourceFunctionName(namingFlags)
 
         // then
@@ -594,7 +609,7 @@ internal class PulumiNameTest {
 
         // when
         val pulumiName = PulumiName.from(token, namingConfiguration)
-        val namingFlags = NamingFlags(Root, Resource, Input, Java)
+        val namingFlags = NamingFlags(Root, Resource, Input, Kotlin)
         val resourceFunctionName = pulumiName.toResourceFunctionName(namingFlags)
 
         // then
@@ -609,7 +624,7 @@ internal class PulumiNameTest {
 
         // when
         val pulumiName = PulumiName.from(token, namingConfiguration)
-        val namingFlags = NamingFlags(Root, Resource, Input, Java)
+        val namingFlags = NamingFlags(Root, Resource, Input, Kotlin)
         val resourceFunctionName = pulumiName.toResourceFunctionName(namingFlags)
 
         // then
diff --git a/src/test/kotlin/org/virtuslab/pulumikotlin/codegen/utils/StringUtilsKtTest.kt b/src/test/kotlin/org/virtuslab/pulumikotlin/codegen/utils/StringUtilsKtTest.kt
index 1da41b1f7..eb8796801 100644
--- a/src/test/kotlin/org/virtuslab/pulumikotlin/codegen/utils/StringUtilsKtTest.kt
+++ b/src/test/kotlin/org/virtuslab/pulumikotlin/codegen/utils/StringUtilsKtTest.kt
@@ -28,8 +28,23 @@ internal class StringUtilsKtTest {
     }
 
     @Test
-    fun `should turn the expected number of character lowercase`() {
-        assertEquals("sslCertificate", "SSLCertificate".lowercaseBefore(3))
+    fun `should do nothing when trying to turn all characters before index=0 lowercase`() {
+        assertEquals("ABCD", "ABCD".lowercaseBefore(index = 0))
+    }
+
+    @Test
+    fun `should turn all characters before index=1 lowercase`() {
+        assertEquals("aBCD", "ABCD".lowercaseBefore(index = 1))
+    }
+
+    @Test
+    fun `should turn all characters before index=3 lowercase`() {
+        assertEquals("abcD", "ABCD".lowercaseBefore(index = 3))
+    }
+
+    @Test
+    fun `should turn all characters before index=4 to lower case in a string with 4 characters`() {
+        assertEquals("abcd", "ABCD".lowercaseBefore(index = 4))
     }
 
     @Suppress("unused")