diff --git a/cmake/GtsamMakeConfigFile.cmake b/cmake/GtsamMakeConfigFile.cmake
index 2fff888ef..0479a2524 100644
--- a/cmake/GtsamMakeConfigFile.cmake
+++ b/cmake/GtsamMakeConfigFile.cmake
@@ -15,7 +15,7 @@ function(GtsamMakeConfigFile PACKAGE_NAME)
 		get_filename_component(name "${ARGV1}" NAME_WE)
 		set(EXTRA_FILE "${name}.cmake")
 		configure_file(${ARGV1} "${PROJECT_BINARY_DIR}/${EXTRA_FILE}" @ONLY)
-		install(FILES "${PROJECT_BINARY_DIR}/${EXTRA_FILE}" DESTINATION "${CMAKE_INSTALL_PREFIX}/${DEF_INSTALL_CMAKE_DIR}")
+		install(FILES "${PROJECT_BINARY_DIR}/${EXTRA_FILE}" DESTINATION "${DEF_INSTALL_CMAKE_DIR}")
 	else()
 		set(EXTRA_FILE "_does_not_exist_")
 	endif()
diff --git a/gtsam/CMakeLists.txt b/gtsam/CMakeLists.txt
index 48bb14f1b..1079b845f 100644
--- a/gtsam/CMakeLists.txt
+++ b/gtsam/CMakeLists.txt
@@ -153,7 +153,7 @@ if(GTSAM_SUPPORT_NESTED_DISSECTION)
     $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/gtsam/3rdparty/metis/include>
     $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/gtsam/3rdparty/metis/libmetis>
     $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/gtsam/3rdparty/metis/GKlib>
-    $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include/gtsam/3rdparty/metis/>
+    $<INSTALL_INTERFACE:include/gtsam/3rdparty/metis/>
   )
 endif()