diff --git a/lib/csu/amd64/crt1.c b/lib/csu/amd64/crt1.c
index 943b07b31a94..3bc4809755a5 100644
--- a/lib/csu/amd64/crt1.c
+++ b/lib/csu/amd64/crt1.c
@@ -43,7 +43,6 @@ typedef void (*fptr)(void);
 extern void _fini(void);
 extern void _init(void);
 extern int main(int, char **, char **);
-extern void _start(char **, void (*)(void));
 
 #ifdef GCRT
 extern void _mcleanup(void);
@@ -55,6 +54,8 @@ extern int etext;
 char **environ;
 const char *__progname = "";
 
+void _start(char **, void (*)(void));
+
 /* The entry function. */
 void
 _start(char **ap, void (*cleanup)(void))
diff --git a/lib/csu/arm/crt1.c b/lib/csu/arm/crt1.c
index 02af3c290470..4319f178cc3e 100644
--- a/lib/csu/arm/crt1.c
+++ b/lib/csu/arm/crt1.c
@@ -74,6 +74,9 @@ char **environ;
 const char *__progname = "";
 struct ps_strings *__ps_strings;
 
+void __start(int, char **, char **, struct ps_strings *,
+    const struct Struct_Obj_Entry *, void (*)(void));
+
 /* The entry function. */
 __asm("	.text			\n"
 "	.align	0		\n"
diff --git a/lib/csu/mips/crt1.c b/lib/csu/mips/crt1.c
index 39f110b002f8..7409c28e248c 100644
--- a/lib/csu/mips/crt1.c
+++ b/lib/csu/mips/crt1.c
@@ -66,6 +66,8 @@ extern int etext;
 char **environ;
 const char *__progname = "";
 
+void __start(char **, void (*)(void), struct Struct_Obj_Entry *, struct ps_strings *);
+
 /* The entry function. */
 void
 __start(char **ap,
diff --git a/lib/csu/powerpc/crt1.c b/lib/csu/powerpc/crt1.c
index 080691c57ccf..3a2f6dd979b3 100644
--- a/lib/csu/powerpc/crt1.c
+++ b/lib/csu/powerpc/crt1.c
@@ -59,8 +59,6 @@ extern int _DYNAMIC;
 extern void _fini(void);
 extern void _init(void);
 extern int main(int, char **, char **);
-extern void _start(int, char **, char **, const struct Struct_Obj_Entry *,
-    void (*)(void), struct ps_strings *);
 
 #ifdef GCRT
 extern void _mcleanup(void);
@@ -73,6 +71,9 @@ char **environ;
 const char *__progname = "";
 struct ps_strings *__ps_strings;
 
+void _start(int, char **, char **, const struct Struct_Obj_Entry *,
+    void (*)(void), struct ps_strings *);
+
 /* The entry function. */
 /*
  * First 5 arguments are specified by the PowerPC SVR4 ABI.
diff --git a/lib/csu/sparc64/crt1.c b/lib/csu/sparc64/crt1.c
index 5d8e37162446..f27c59b6f628 100644
--- a/lib/csu/sparc64/crt1.c
+++ b/lib/csu/sparc64/crt1.c
@@ -50,8 +50,6 @@ extern int _DYNAMIC;
 extern void _fini(void);
 extern void _init(void);
 extern int main(int, char **, char **);
-extern void _start(char **, void (*)(void), struct Struct_Obj_Entry *,
-    struct ps_strings *);
 extern void __sparc_utrap_setup(void);
 
 #ifdef GCRT
@@ -64,6 +62,9 @@ extern int etext;
 char **environ;
 const char *__progname = "";
 
+void _start(char **, void (*)(void), struct Struct_Obj_Entry *,
+    struct ps_strings *);
+
 /* The entry function. */
 /*
  * %o0 holds ps_strings pointer.