diff --git a/src/libslic3r/CMakeLists.txt b/src/libslic3r/CMakeLists.txt
index 0f8f5b2c2..c145eded0 100644
--- a/src/libslic3r/CMakeLists.txt
+++ b/src/libslic3r/CMakeLists.txt
@@ -248,14 +248,16 @@ if (NOT TARGET ${_cgal_tgt})
     set (_cgal_tgt CGAL::CGAL)
 endif ()
 get_target_property(_opts ${_cgal_tgt} INTERFACE_COMPILE_OPTIONS)
-set(_opts_bad "${_opts}")
-set(_opts_good "${_opts}")
-list(FILTER _opts_bad INCLUDE REGEX frounding-math)
-list(FILTER _opts_good EXCLUDE REGEX frounding-math)
-set_target_properties(${_cgal_tgt} PROPERTIES INTERFACE_COMPILE_OPTIONS "${_opts_good}")
+if (_opts)
+    set(_opts_bad "${_opts}")
+    set(_opts_good "${_opts}")
+    list(FILTER _opts_bad INCLUDE REGEX frounding-math)
+    list(FILTER _opts_good EXCLUDE REGEX frounding-math)
+    set_target_properties(${_cgal_tgt} PROPERTIES INTERFACE_COMPILE_OPTIONS "${_opts_good}")
+    target_compile_options(libslic3r_cgal PRIVATE "${_opts_bad}")
+endif()
 
 target_link_libraries(libslic3r_cgal PRIVATE ${_cgal_tgt} libigl)
-target_compile_options(libslic3r_cgal PRIVATE "${_opts_bad}")
 
 encoding_check(libslic3r)