diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/api/IBuildConfigContributor.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/api/IBuildConfigContributor.kt
index 67b2b332..35553f74 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/api/IBuildConfigContributor.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/api/IBuildConfigContributor.kt
@@ -12,5 +12,5 @@ interface IBuildConfigContributor : ISimpleAffinity<Project> {
     /**
      * The suffix of the generated BuildConfig, e.g. ".java".
      */
-    val suffix: String
+    val buildConfigSuffix: String
 }
diff --git a/src/main/kotlin/com/beust/kobalt/plugin/java/JavaPlugin.kt b/src/main/kotlin/com/beust/kobalt/plugin/java/JavaPlugin.kt
index 494db89f..783efe2f 100644
--- a/src/main/kotlin/com/beust/kobalt/plugin/java/JavaPlugin.kt
+++ b/src/main/kotlin/com/beust/kobalt/plugin/java/JavaPlugin.kt
@@ -44,7 +44,7 @@ class JavaPlugin @Inject constructor(val javaCompiler: JavaCompiler)
             = maybeCompilerArgs(project, configurationFor(project)?.compilerArgs ?: listOf<String>())
 
     // ICompilerContributor
-    override val sourceSuffixes = listOf("java")
+    override val sourceSuffixes = listOf(".java")
 
     override fun compile(project: Project, context: KobaltContext, info: CompilerActionInfo) : TaskResult {
         val result =
@@ -64,7 +64,7 @@ class JavaPlugin @Inject constructor(val javaCompiler: JavaCompiler)
     // IBuildConfigContributor
     override fun affinity(project: Project) = if (project.projectExtra.suffixesFound.contains("java")) 1 else 0
 
-    override val suffix = ".java"
+    override val buildConfigSuffix = ".java"
 
     override fun generateBuildConfig(project: Project, context: KobaltContext, packageName: String,
             variant: Variant, buildConfigs: List<BuildConfig>): String {
diff --git a/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinPlugin.kt b/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinPlugin.kt
index e5df85e2..48e2b44d 100644
--- a/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinPlugin.kt
+++ b/src/main/kotlin/com/beust/kobalt/plugin/kotlin/KotlinPlugin.kt
@@ -101,7 +101,7 @@ class KotlinPlugin @Inject constructor(val executors: KobaltExecutors)
 
     // ICompilerContributor
 
-    override val sourceSuffixes = listOf("kt")
+    override val sourceSuffixes = listOf(".kt")
 
     override fun compile(project: Project, context: KobaltContext, info: CompilerActionInfo) : TaskResult {
         val result =
@@ -129,7 +129,7 @@ class KotlinPlugin @Inject constructor(val executors: KobaltExecutors)
     // IBuildConfigContributor
     override fun affinity(project: Project) = if (project.projectExtra.suffixesFound.contains("kotlin")) 2 else 0
 
-    override val suffix = ".kt"
+    override val buildConfigSuffix = ".kt"
 
     override fun generateBuildConfig(project: Project, context: KobaltContext, packageName: String,
             variant: Variant, buildConfigs: List<BuildConfig>): String {