diff --git a/src/dump.c b/src/dump.c
index 0c5ded2e2..511ee3664 100644
--- a/src/dump.c
+++ b/src/dump.c
@@ -15,12 +15,8 @@
 
 #ifndef MRB_NO_FLOAT
 #include <mruby/endian.h>
-#ifdef MRB_USE_FLOAT32
-#define MRB_FLOAT_FMT "%.9g"
-#else
 #define MRB_FLOAT_FMT "%.17g"
 #endif
-#endif
 
 static size_t get_irep_record_size_1(mrb_state *mrb, const mrb_irep *irep);