diff --git a/configure.in b/configure.in
index 9d9d0d45de1..d826e1eadc3 100644
--- a/configure.in
+++ b/configure.in
@@ -374,6 +374,7 @@ sys/vfs.h \
 sys/sysexits.h \
 sys/varargs.h \
 sys/wait.h \
+sys/loadavg.h \
 termios.h \
 unistd.h \
 unix.h \
diff --git a/ext/standard/basic_functions.c b/ext/standard/basic_functions.c
index 45f7c8bcbca..ad13aba04c9 100644
--- a/ext/standard/basic_functions.c
+++ b/ext/standard/basic_functions.c
@@ -78,6 +78,10 @@ typedef struct yy_buffer_state *YY_BUFFER_STATE;
 # include <sys/mman.h>
 #endif
 
+#if HAVE_SYS_LOADAVG_H
+# include <sys/loadavg.h>
+#endif
+
 #ifdef HARTMUT_0
 #include <getopt.h>
 #endif