diff --git a/interface/CMakeLists.txt b/interface/CMakeLists.txt
index 9e356aa5eb..c4c9ea643a 100644
--- a/interface/CMakeLists.txt
+++ b/interface/CMakeLists.txt
@@ -40,6 +40,7 @@ ExternalProject_Add(
     portaudio
     PREFIX ${PORTAUDIO_PROJ_DIR}
     BINARY_DIR ${PORTAUDIO_PROJ_DIR}/src/portaudio
+    INSTALL_DIR ${PORTAUDIO_PROJ_DIR}/install
     URL ${PORTAUDIO_DIR}/pa_snapshot_020813.tgz
     CONFIGURE_COMMAND <SOURCE_DIR>/configure
     BUILD_COMMAND make