diff --git a/dispd/client/session.c b/dispd/client/session.c
index f85f3fa5..3ba09470 100644
--- a/dispd/client/session.c
+++ b/dispd/client/session.c
@@ -91,13 +91,13 @@ bool dispd_session_setup_game_rgba(struct dispd_session* session)
 		const char* chvideomode = "chvideomode";
 #if 1
 		// TODO chvideomode currently launches --bpp 32 as a program...
-		execlp(chvideomode, chvideomode, NULL);
+		execlp(chvideomode, chvideomode, (const char*) NULL);
 #else
 		execlp(chvideomode, chvideomode,
 		       "--bpp", "32",
 		       "--show-graphics", "true",
 		       "--show-text", "false",
-		       NULL);
+		       (const char*) NULL);
 #endif
 		perror(chvideomode);
 		exit(127);
diff --git a/init/init.c b/init/init.c
index 1ed41376..b68a68a8 100644
--- a/init/init.c
+++ b/init/init.c
@@ -395,7 +395,7 @@ static void set_kblayout(void)
 		return warning("unable to set keyboard layout: fork: %m");
 	if ( !child_pid )
 	{
-		execlp("chkblayout", "chkblayout", "--", kblayout, (char*) NULL);
+		execlp("chkblayout", "chkblayout", "--", kblayout, (const char*) NULL);
 		warning("setting keyboard layout: chkblayout: %m");
 		_exit(127);
 	}
diff --git a/libc/stdio/popen.c b/libc/stdio/popen.c
index 405e74b8..7c2ff1b0 100644
--- a/libc/stdio/popen.c
+++ b/libc/stdio/popen.c
@@ -131,7 +131,7 @@ FILE* popen(const char* command, const char* type)
         close(pipefds[unused_end]) )
 		_exit(127);
 
-	execlp("sh", "sh", "-c", command, NULL);
+	execlp("sh", "sh", "-c", command, (const char*) NULL);
 	_exit(127);
 
 cleanup_pipes:
diff --git a/libc/stdlib/system.c b/libc/stdlib/system.c
index fee02d47..efb36cc7 100644
--- a/libc/stdlib/system.c
+++ b/libc/stdlib/system.c
@@ -39,6 +39,6 @@ int system(const char* command)
 			return ret_error;
 		return status;
 	}
-	execlp("sh", "sh", "-c", command, NULL);
+	execlp("sh", "sh", "-c", command, (const char*) NULL);
 	_exit(exit_error);
 }
diff --git a/sh/proper-sh.c b/sh/proper-sh.c
index 3f3d60d8..89fbae4d 100644
--- a/sh/proper-sh.c
+++ b/sh/proper-sh.c
@@ -46,7 +46,7 @@ bool is_existing_shell(const char* candidate)
 		open("/dev/null", O_RDONLY);
 		open("/dev/null", O_WRONLY);
 		open("/dev/null", O_WRONLY);
-		execlp("which", "which", "--", candidate, (char*) NULL);
+		execlp("which", "which", "--", candidate, (const char*) NULL);
 		exit(127);
 	}
 	int status;
diff --git a/sh/sh.c b/sh/sh.c
index 221195b9..af0292b4 100644
--- a/sh/sh.c
+++ b/sh/sh.c
@@ -1299,7 +1299,7 @@ struct execute_result execute(char** tokens,
 	if ( interactive && errno == ENOENT )
 	{
 		int errno_saved = errno;
-		execlp("command-not-found", "command-not-found", argv[0], NULL);
+		execlp("command-not-found", "command-not-found", argv[0], (const char*) NULL);
 		errno = errno_saved;
 	}
 
diff --git a/trianglix/trianglix.cpp b/trianglix/trianglix.cpp
index c0f42c77..02da4d95 100644
--- a/trianglix/trianglix.cpp
+++ b/trianglix/trianglix.cpp
@@ -193,7 +193,7 @@ static void ExecuteFile(const char* path, int curdirfd)
 	if ( ForkAndWait() )
 	{
 		fchdir(curdirfd);
-		execl(path, path, (char*) NULL);
+		execl(path, path, (const char*) NULL);
 		_exit(127);
 	}
 }
@@ -204,7 +204,7 @@ static void DisplayFile(const char* path, int curdirfd)
 	if ( ForkAndWait() )
 	{
 		fchdir(curdirfd);
-		execlp("editor", "editor", path, (char*) NULL);
+		execlp("editor", "editor", path, (const char*) NULL);
 		_exit(127);
 	}
 }
@@ -215,7 +215,7 @@ static void ExecutePath(const char* path, int curdirfd)
 	if ( ForkAndWait() )
 	{
 		fchdir(curdirfd);
-		execlp(path, path, (char*) NULL);
+		execlp(path, path, (const char*) NULL);
 		_exit(127);
 	}
 }
@@ -229,7 +229,7 @@ void ExecuteShellCommand(const char* command, int curdirfd)
 	if ( ForkAndWait() )
 	{
 		fchdir(curdirfd);
-		execlp("sh", "sh", "-c", command, (char*) NULL);
+		execlp("sh", "sh", "-c", command, (const char*) NULL);
 		error(127, errno, "`%s'", "sh");
 	}
 	unsigned int cur_termmode;
@@ -505,7 +505,7 @@ private:
 
 void exec_program::invoke()
 {
-	execlp(program, program, (char*) NULL);
+	execlp(program, program, (const char*) NULL);
 }
 
 class development : public object
diff --git a/utils/help.c b/utils/help.c
index d2698af2..eb8cf803 100644
--- a/utils/help.c
+++ b/utils/help.c
@@ -52,8 +52,8 @@ int main(void)
 			dup2(pipe_fds[0], 0);
 			close(pipe_fds[0]);
 			close(pipe_fds[1]);
-			execlp("column", "column", NULL);
-			execlp("cat", "cat", NULL);
+			execlp("column", "column", (const char*) NULL);
+			execlp("cat", "cat", (const char*) NULL);
 			int ic;
 			while ( (ic = fgetc(stdin)) != EOF )
 				fputc(ic, stdout);