diff --git a/src/libsysprof-capture/sysprof-address.c b/src/libsysprof-capture/sysprof-address.c
index 0ddb68ce..1b125015 100644
--- a/src/libsysprof-capture/sysprof-address.c
+++ b/src/libsysprof-capture/sysprof-address.c
@@ -62,6 +62,7 @@
 # include "sysprof-address-fallback.h"
 #endif
 #include <stdbool.h>
+#include <stddef.h>
 
 #include "sysprof-address.h"