diff --git a/headers/build/BeOSBuildCompatibility.h b/headers/build/BeOSBuildCompatibility.h
index 8a6b8ff571..5eff06a5c8 100644
--- a/headers/build/BeOSBuildCompatibility.h
+++ b/headers/build/BeOSBuildCompatibility.h
@@ -52,9 +52,9 @@ extern size_t	strnlen(const char* string, size_t length);
 extern ssize_t  read_pos(int fd, off_t pos, void* buffer, size_t count);
 extern ssize_t  write_pos(int fd, off_t pos, const void* buffer, size_t count);
 extern ssize_t	readv_pos(int fd, off_t pos, const struct iovec* vec,
-					size_t count);
+					int count);
 extern ssize_t	writev_pos(int fd, off_t pos, const struct iovec* vec,
-					size_t count);
+					int count);
 
 
 // There's no O_NOTRAVERSE under Linux and FreeBSD -- we replace it with a flag