diff --git a/ui/impl.cmake b/ui/impl.cmake
index 7be03a2..a0469bf 100644
--- a/ui/impl.cmake
+++ b/ui/impl.cmake
@@ -12,10 +12,10 @@ if("${CMAKE_VERSION}" VERSION_GREATER_EQUAL "3.28")
 endif()
 
 add_custom_command(
-	OUTPUT ${impl_basename}.a
-	COMMAND env CARGO_TARGET_DIR=${CARGO_TARGET_DIR} ${CARGO} build --release --package PROJECT-NAME-impl
-	WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-	DEPFILE ${impl_basename}.d
+	OUTPUT "${impl_basename}.a"
+	COMMAND env "CARGO_TARGET_DIR=${CARGO_TARGET_DIR}" ${CARGO} build --release --package PROJECT-NAME-impl
+	WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+	DEPFILE "${impl_basename}.d"
 	USES_TERMINAL
 	VERBATIM
 	${cargo_cmake_args}
@@ -23,11 +23,11 @@ add_custom_command(
 
 # HACK ensure CMake *actually adds* the command above
 add_custom_target(build_impl
-	DEPENDS ${impl_basename}.a
+	DEPENDS "${impl_basename}.a"
 )
 
 add_library(PROJECT_NAME_impl STATIC IMPORTED)
 
 set_target_properties(PROJECT_NAME_impl PROPERTIES
-	IMPORTED_LOCATION ${impl_basename}.a
+	IMPORTED_LOCATION "${impl_basename}.a"
 )