diff --git a/app/build-dictionaries.gradle b/app/build-dictionaries.gradle
index 4e9bc509..f1c98b89 100644
--- a/app/build-dictionaries.gradle
+++ b/app/build-dictionaries.gradle
@@ -8,6 +8,10 @@ ext.convertDictionaries = { definitionsInputDir, dictionariesInputDir, dictionar
 	int errorCount = 0
 
 	def errorStream = fileTree(dir: definitionsInputDir).getFiles().parallelStream().map { definition ->
+		if (!definition.name.endsWith("yml")) {
+			return ""
+		}
+
 		def (_, sounds, prependSoundsToWords, noSyllables, locale, dictionaryFile, langFileErrorCount, langFileErrorMsg) = parseLanguageDefintion(definition, dictionariesInputDir)
 		errorCount += langFileErrorCount
 		if (!langFileErrorMsg.isEmpty()) {
diff --git a/app/validate-languages.gradle b/app/validate-languages.gradle
index db56590f..2ccef770 100644
--- a/app/validate-languages.gradle
+++ b/app/validate-languages.gradle
@@ -5,6 +5,10 @@ ext.validateLanguageFiles = { definitionsDir, dictionariesDir, validationDir ->
 	int errorCount = 0
 
 	def errorStream = fileTree(dir: definitionsDir).getFiles().parallelStream().map { definition ->
+		if (!definition.name.endsWith("yml")) {
+			return ""
+		}
+
 		if (errorCount >= MAX_ERRORS) {
 			return "Too many errors! Skipping: ${definition}\n"
 		}