diff --git a/cmake/Tests.cmake b/cmake/Tests.cmake
index bc427a39a..d345f1fa1 100644
--- a/cmake/Tests.cmake
+++ b/cmake/Tests.cmake
@@ -138,6 +138,9 @@ if(DEFINED ASAN)
         message(FATAL_ERROR "ASAN requires defining the CMake variable Rust_CARGO_TARGET to the
             intended target triple")
     endif()
+endif()
+
+if(DEFINED Rust_CARGO_TARGET)
     list(APPEND cargo_test_flags "--target" ${Rust_CARGO_TARGET})
     list(APPEND cargo_test_flags "--lib")
 endif()