diff --git a/compat/getdtablesize.c b/compat/getdtablesize.c
index 9376218..ec22d41 100644
--- a/compat/getdtablesize.c
+++ b/compat/getdtablesize.c
@@ -14,6 +14,8 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include "../config.h"
+
 #include <unistd.h>
 
 int
diff --git a/compat/memmem.c b/compat/memmem.c
index 9b11960..5e6907b 100644
--- a/compat/memmem.c
+++ b/compat/memmem.c
@@ -23,6 +23,8 @@
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#include "../config.h"
+
 #include <string.h>
 #include <stdint.h>
 
diff --git a/compat/setresgid.c b/compat/setresgid.c
index ec625cd..d0d2fb7 100644
--- a/compat/setresgid.c
+++ b/compat/setresgid.c
@@ -14,6 +14,8 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include "../config.h"
+
 #include <sys/types.h>
 #include <unistd.h>
 
diff --git a/compat/setresuid.c b/compat/setresuid.c
index a033d99..62e3d98 100644
--- a/compat/setresuid.c
+++ b/compat/setresuid.c
@@ -14,6 +14,8 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include "../config.h"
+
 #include <sys/types.h>
 
 #include <errno.h>