diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4aa979345d9..db9966bcb00 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -144,6 +144,7 @@ check_symbol_exists(dup2 unistd.h HAVE_DUP2)
 check_symbol_exists(fork unistd.h HAVE_FORK)
 check_symbol_exists(execve unistd.h HAVE_EXECVE)
 check_symbol_exists(ftruncate unistd.h HAVE_FTRUNCATE)
+check_symbol_exists(nice unistd.h HAVE_NICE)
 check_symbol_exists(setgid unistd.h HAVE_SETGID)
 check_symbol_exists(setuid unistd.h HAVE_SETUID)
 check_symbol_exists(setsid unistd.h HAVE_SETSID)
diff --git a/config.h.cmake.in b/config.h.cmake.in
index 848c5057aa4..0ef8fe315ff 100644
--- a/config.h.cmake.in
+++ b/config.h.cmake.in
@@ -215,7 +215,7 @@ don't. */
 #cmakedefine HAVE_NET_TUN_IF_TUN_H
 
 /* Define to 1 if you have the `nice' function. */
-#undef HAVE_NICE
+#cmakedefine HAVE_NICE
 
 /* Define to 1 if you have the `openlog' function. */
 #cmakedefine HAVE_OPENLOG