diff --git a/otherlibs/threads/scheduler.c b/otherlibs/threads/scheduler.c
index 5881bc6b2d5d..0e94489bd166 100644
--- a/otherlibs/threads/scheduler.c
+++ b/otherlibs/threads/scheduler.c
@@ -32,6 +32,10 @@
 #include "Cannot compile libthreads, system calls missing"
 #endif
 
+#ifdef __OpenBSD__
+#include <string.h>
+#endif
+
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/wait.h>
diff --git a/otherlibs/unix/select.c b/otherlibs/unix/select.c
index c2475606914d..5cbf42ca10c2 100644
--- a/otherlibs/unix/select.c
+++ b/otherlibs/unix/select.c
@@ -23,6 +23,11 @@
 #include <sys/time.h>
 #ifdef HAS_SYS_SELECT_H
 #include <sys/select.h>
+
+#endif
+
+#ifdef __OpenBSD__
+#include <string.h>
 #endif
 
 #ifdef FD_ISSET