diff --git a/CMakeLists.txt b/CMakeLists.txt
index feff17b401..dda171be74 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ option(SPHINXSYS_2D "Build sphinxsys_2d library" ON)
 option(SPHINXSYS_3D "Build sphinxsys_3d library" ON)
 option(SPHINXSYS_BUILD_TESTS "Build tests" ON)
 option(SPHINXSYS_DEVELOPER_MODE "Developer mode has more flags active for code quality" ON)
-option(SPHINXSYS_USE_FLOAT "Build using float or not" OFF)
+option(SPHINXSYS_USE_FLOAT "Build using float (single-precision floating-point format) as primary type" OFF)
 
 # ------ Global properties (Some cannot be set on INTERFACE targets)
 set(CMAKE_VERBOSE_MAKEFILE OFF CACHE BOOL "Enable verbose compilation commands for Makefile and Ninja" FORCE) # Extra fluff needed for Ninja: https://github.com/ninja-build/ninja/issues/900
@@ -46,6 +46,8 @@ elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     # target_compile_options(sphinxsys_core INTERFACE $<$<BOOL:${SPHINXSYS_DEVELOPER_MODE}>:-Wpedantic>) # For strict C++ standard compliance # TODO:
 endif()
 
+target_compile_definitions(sphinxsys_core INTERFACE SPHINXSYS_USE_FLOAT=$<BOOL:${SPHINXSYS_USE_FLOAT}>)
+
 # ------ Dependencies
 # ## SIMD flags
 find_package(SIMD QUIET)
@@ -79,11 +81,6 @@ set(Boost_NO_WARN_NEW_VERSIONS TRUE) # In case your CMake version is older than
 find_package(Boost REQUIRED)
 find_path(BOOST_INCLUDE_DIR boost/geometry) # Header-only Boost libraries are not components
 
-if(SPHINXSYS_USE_FLOAT)
-    target_compile_definitions(sphinxsys_core INTERFACE USE_FLOAT)
-    message("-- Use float as default")
-endif()
-
 if(NOT BOOST_INCLUDE_DIR)
     message(FATAL_ERROR "Please install Boost.Geometry library")
 endif()
diff --git a/src/shared/common/base_data_type.h b/src/shared/common/base_data_type.h
index 880c476d3c..bb161cd6e1 100644
--- a/src/shared/common/base_data_type.h
+++ b/src/shared/common/base_data_type.h
@@ -69,7 +69,7 @@ namespace SPH
 	 * 			Using -mtune=native produces code optimized for the local machine under the constraints of the selected instruction set.
 	 */
 
-#if USE_FLOAT
+#if SPHINXSYS_USE_FLOAT
 		using Real = float;
 		using EigMat = Eigen::MatrixXf;
 #else