diff --git a/client/whereami.c b/client/whereami.c
index a18d2d2f7..9b154c628 100644
--- a/client/whereami.c
+++ b/client/whereami.c
@@ -213,6 +213,7 @@ int WAI_PREFIX(getExecutablePath)(char *out, int capacity, int *dirname_length)
 #if defined(__ANDROID__) || defined(ANDROID)
 #include <fcntl.h>
 #include <sys/mman.h>
+#include <unistd.h>
 #endif
 
 WAI_NOINLINE