diff --git a/extlib/benz/include/picrin.h b/extlib/benz/include/picrin.h
index a95a6935..0c2ef296 100644
--- a/extlib/benz/include/picrin.h
+++ b/extlib/benz/include/picrin.h
@@ -33,13 +33,8 @@ extern "C" {
 #include <stdarg.h>
 
 #include "picrin/config.h"
-#include "picrin/util.h"
+
 #include "picrin/compat.h"
-
-#if PIC_ENABLE_FLOAT
-# include <math.h>
-#endif
-
 #include "picrin/xvect.h"
 #include "picrin/xhash.h"
 
diff --git a/extlib/benz/include/picrin/compat.h b/extlib/benz/include/picrin/compat.h
index cca83d95..24f82691 100644
--- a/extlib/benz/include/picrin/compat.h
+++ b/extlib/benz/include/picrin/compat.h
@@ -9,6 +9,77 @@
 extern "C" {
 #endif
 
+#if __STDC_VERSION__ >= 199901L
+# include <stdbool.h>
+#else
+# define bool char
+# define true 1
+# define false 0
+#endif
+
+#if __STDC_VERSION__ >= 199901L
+# include <stddef.h>
+#elif ! defined(offsetof)
+# define offsetof(s,m) ((size_t)&(((s *)NULL)->m))
+#endif
+
+#if __STDC_VERSION__ >= 201112L
+# include <stdnoreturn.h>
+# define PIC_NORETURN noreturn
+#elif __GNUC__ || __clang__
+# define PIC_NORETURN __attribute__((noreturn))
+#else
+# define PIC_NORETURN
+#endif
+
+#if __STDC_VERSION__ >= 199901L
+# define PIC_INLINE static inline
+#elif __GNUC__ || __clang__
+# define PIC_INLINE static __inline__
+#else
+# define PIC_INLINE static
+#endif
+
+#define PIC_FALLTHROUGH ((void)0)
+
+#if __GNUC__ || __clang__
+# define PIC_UNUSED(v) __attribute__((unused)) v
+#else
+# define PIC_UNUSED(v) v
+#endif
+
+#define PIC_GENSYM2_(x,y) PIC_G##x##_##y##_
+#define PIC_GENSYM1_(x,y) PIC_GENSYM2_(x,y)
+#if defined(__COUNTER__)
+# define PIC_GENSYM(x) PIC_GENSYM1_(__COUNTER__,x)
+#else
+# define PIC_GENSYM(x) PIC_GENSYM1_(__LINE__,x)
+#endif
+
+#if __GNUC__
+# define GCC_VERSION (__GNUC__ * 10000          \
+   + __GNUC_MINOR__ * 100                       \
+   + __GNUC_PATCHLEVEL__)
+#endif
+#if GCC_VERSION >= 40500 || __clang__
+# define PIC_UNREACHABLE() (__builtin_unreachable())
+#else
+# define PIC_UNREACHABLE() (assert(false))
+#endif
+#if __GNUC__
+# undef GCC_VERSION
+#endif
+
+#define PIC_SWAP(type,a,b)                      \
+  PIC_SWAP_HELPER_(type, PIC_GENSYM(tmp), a, b)
+#define PIC_SWAP_HELPER_(type,tmp,a,b)          \
+  do {                                          \
+    type tmp = (a);                             \
+    (a) = (b);                                  \
+    (b) = tmp;                                  \
+  } while (0)
+
+
 #if PIC_ENABLE_LIBC
 
 #include <string.h>
@@ -134,6 +205,10 @@ strcpy(char *dst, const char *src)
 
 #endif
 
+#if PIC_ENABLE_FLOAT
+# include <math.h>
+#endif
+
 #if defined(__cplusplus)
 }
 #endif
diff --git a/extlib/benz/include/picrin/util.h b/extlib/benz/include/picrin/util.h
deleted file mode 100644
index ad816c70..00000000
--- a/extlib/benz/include/picrin/util.h
+++ /dev/null
@@ -1,86 +0,0 @@
-/**
- * See Copyright Notice in picrin.h
- */
-
-#ifndef PICRIN_UTIL_H
-#define PICRIN_UTIL_H
-
-#if defined(__cplusplus)
-extern "C" {
-#endif
-
-#if __STDC_VERSION__ >= 199901L
-# include <stdbool.h>
-#else
-# define bool char
-# define true 1
-# define false 0
-#endif
-
-#if __STDC_VERSION__ >= 199901L
-# include <stddef.h>
-#elif ! defined(offsetof)
-# define offsetof(s,m) ((size_t)&(((s *)NULL)->m))
-#endif
-
-#if __STDC_VERSION__ >= 201112L
-# include <stdnoreturn.h>
-# define PIC_NORETURN noreturn
-#elif __GNUC__ || __clang__
-# define PIC_NORETURN __attribute__((noreturn))
-#else
-# define PIC_NORETURN
-#endif
-
-#if __STDC_VERSION__ >= 199901L
-# define PIC_INLINE static inline
-#elif __GNUC__ || __clang__
-# define PIC_INLINE static __inline__
-#else
-# define PIC_INLINE static
-#endif
-
-#define PIC_FALLTHROUGH ((void)0)
-
-#if __GNUC__ || __clang__
-# define PIC_UNUSED(v) __attribute__((unused)) v
-#else
-# define PIC_UNUSED(v) v
-#endif
-
-#define PIC_GENSYM2_(x,y) PIC_G##x##_##y##_
-#define PIC_GENSYM1_(x,y) PIC_GENSYM2_(x,y)
-#if defined(__COUNTER__)
-# define PIC_GENSYM(x) PIC_GENSYM1_(__COUNTER__,x)
-#else
-# define PIC_GENSYM(x) PIC_GENSYM1_(__LINE__,x)
-#endif
-
-#if __GNUC__
-# define GCC_VERSION (__GNUC__ * 10000          \
-   + __GNUC_MINOR__ * 100                       \
-   + __GNUC_PATCHLEVEL__)
-#endif
-#if GCC_VERSION >= 40500 || __clang__
-# define PIC_UNREACHABLE() (__builtin_unreachable())
-#else
-# define PIC_UNREACHABLE() (assert(false))
-#endif
-#if __GNUC__
-# undef GCC_VERSION
-#endif
-
-#define PIC_SWAP(type,a,b)                      \
-  PIC_SWAP_HELPER_(type, PIC_GENSYM(tmp), a, b)
-#define PIC_SWAP_HELPER_(type,tmp,a,b)          \
-  do {                                          \
-    type tmp = (a);                             \
-    (a) = (b);                                  \
-    (b) = tmp;                                  \
-  } while (0)
-
-#if defined(__cplusplus)
-}
-#endif
-
-#endif