diff --git a/unix-cpy/mpconfigport.h b/unix-cpy/mpconfigport.h
index 3fc186677280634034f15356e8a6e23416f25968..6351f0c4feec7434e8ce375a2cd77cd570d4c9b5 100644
--- a/unix-cpy/mpconfigport.h
+++ b/unix-cpy/mpconfigport.h
@@ -2,7 +2,7 @@
 
 #define MICROPY_EMIT_CPYTHON        (1)
 #define MICROPY_ENABLE_LEXER_UNIX   (1)
-#define MICROPY_ENABLE_FLOAT        (1)
+#define MICROPY_FLOAT_IMPL          (MICROPY_FLOAT_IMPL_DOUBLE)
 
 // type definitions for the specific machine