diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index 25f8c5dbca..611937785f 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -74,7 +74,7 @@ endif()
 # Sirit
 # TODO(crueter): spirv-tools doesn't work w/ system
 set(SPIRV_WERROR OFF)
-AddJsonPackage(spirv_headers)
+AddJsonPackage(spirv-headers)
 
 AddJsonPackage(sirit)