diff --git a/cmake/system.cmake b/cmake/system.cmake
index c0f3c6ed2..aa342c3d2 100644
--- a/cmake/system.cmake
+++ b/cmake/system.cmake
@@ -393,6 +393,18 @@ set(REVISION "-r${OpenBLAS_VERSION}")
 set(MAJOR_VERSION ${OpenBLAS_MAJOR_VERSION})
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CCOMMON_OPT}")
+if (BUILD_SINGLE)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DBUILD_SINGLE")
+endif()
+if (BUILD_DOUBLE)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DBUILD_DOUBLE")
+endif()
+if (BUILD_COMPLEX)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DBUILD_COMPLEX")
+endif()
+if (BUILD_COMPLEX16)
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DBUILD_COMPLEX16")
+endif()
 if(NOT MSVC)
 set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} ${CCOMMON_OPT}")
 endif()