diff --git a/cmake/externals/glm/CMakeLists.txt b/cmake/externals/glm/CMakeLists.txt
index a9b4ad118d..1fa393e69e 100644
--- a/cmake/externals/glm/CMakeLists.txt
+++ b/cmake/externals/glm/CMakeLists.txt
@@ -3,7 +3,6 @@ set(EXTERNAL_NAME glm)
 include(ExternalProject)
 ExternalProject_Add(
   ${EXTERNAL_NAME}
-  PREFIX ${EXTERNAL_NAME}
   URL http://pkgs.fedoraproject.org/repo/pkgs/glm/glm-0.9.5.4.zip/fab76fc982b256b46208e5c750ed456a/glm-0.9.5.4.zip
   CMAKE_ARGS -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
   LOG_DOWNLOAD ON
diff --git a/cmake/externals/gverb/CMakeLists.txt b/cmake/externals/gverb/CMakeLists.txt
index 463ee26ff0..972b5b602f 100644
--- a/cmake/externals/gverb/CMakeLists.txt
+++ b/cmake/externals/gverb/CMakeLists.txt
@@ -7,7 +7,6 @@ endif ()
 include(ExternalProject)
 ExternalProject_Add(
   ${EXTERNAL_NAME}
-  PREFIX ${EXTERNAL_NAME}
   GIT_REPOSITORY https://github.com/birarda/gverb.git
   CMAKE_ARGS ${ANDROID_CMAKE_ARGS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
   LOG_DOWNLOAD ON
diff --git a/cmake/externals/soxr/CMakeLists.txt b/cmake/externals/soxr/CMakeLists.txt
index 2c8dd5de7d..49d7c7598a 100644
--- a/cmake/externals/soxr/CMakeLists.txt
+++ b/cmake/externals/soxr/CMakeLists.txt
@@ -7,7 +7,6 @@ endif ()
 include(ExternalProject)
 ExternalProject_Add(
   ${EXTERNAL_NAME}
-  PREFIX ${EXTERNAL_NAME}
   URL http://hifi-public.s3.amazonaws.com/dependencies/soxr-0.1.1.zip
   CMAKE_ARGS ${PLATFORM_CMAKE_ARGS} -DBUILD_SHARED_LIBS=1 -DBUILD_TESTS=0 -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
   LOG_DOWNLOAD ON