diff --git a/gtsam/nonlinear/CMakeLists.txt b/gtsam/nonlinear/CMakeLists.txt
index ad4824817..29ff2efa5 100644
--- a/gtsam/nonlinear/CMakeLists.txt
+++ b/gtsam/nonlinear/CMakeLists.txt
@@ -1,9 +1,9 @@
 # Install headers
 file(GLOB nonlinear_headers "*.h")
-install(FILES ${nonlinear_headers} DESTINATION include/gtsam/nonlinear)
+install(FILES ${nonlinear_headers} DESTINATION "include/gtsam/nonlinear")
 
 file(GLOB nonlinear_headers_internal "internal/*.h")
-install(FILES ${nonlinear_headers_internal} DESTINATION include/gtsam/nonlinear/internal)
+install(FILES ${nonlinear_headers_internal} DESTINATION "include/gtsam/nonlinear/internal")
 
 # Build tests
 add_subdirectory(tests)