diff --git a/interface/CMakeLists.txt b/interface/CMakeLists.txt
index 4f96770120..be966f549f 100644
--- a/interface/CMakeLists.txt
+++ b/interface/CMakeLists.txt
@@ -10,7 +10,7 @@ project(${TARGET_NAME})
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/../cmake/modules/")
 set(LODEPNG_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/external/LodePNG)
 set(LIBOVR_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/external/LibOVR)
-set(PORTAUDIO_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/external/portaudio)
+set(PORTAUDIO_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/external/PortAudio)
 
 if (APPLE)
   set(GL_HEADERS "#include <GLUT/glut.h>\n#include <OpenGL/glext.h>")