diff --git a/lang/cpp/src/key.cpp b/lang/cpp/src/key.cpp
index df3dc02c..4531a2bf 100644
--- a/lang/cpp/src/key.cpp
+++ b/lang/cpp/src/key.cpp
@@ -33,6 +33,7 @@
 #include <gpgme.h>
 
 #include <string.h>
+#include <strings.h>
 #include <istream>
 #include <iterator>
 
diff --git a/tests/gpg/t-cancel.c b/tests/gpg/t-cancel.c
index af98af98..16a062a7 100644
--- a/tests/gpg/t-cancel.c
+++ b/tests/gpg/t-cancel.c
@@ -34,6 +34,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <pthread.h>
+#include <sys/select.h>
 
 #include <gpgme.h>