diff --git a/src/whereami.c b/src/whereami.c
index be6d259..aa1c2d4 100644
--- a/src/whereami.c
+++ b/src/whereami.c
@@ -223,6 +223,7 @@ 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