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
diff --git a/src/build/libroot/fs.cpp b/src/build/libroot/fs.cpp
index 517668a90c..dadcbd7e5b 100644
--- a/src/build/libroot/fs.cpp
+++ b/src/build/libroot/fs.cpp
@@ -1208,7 +1208,7 @@ write_pos(int fd, off_t pos, const void *buffer, size_t bufferSize)
 
 // readv_pos
 ssize_t
-readv_pos(int fd, off_t pos, const struct iovec *vec, size_t count)
+readv_pos(int fd, off_t pos, const struct iovec *vec, int count)
 {
 	// seek
 	off_t result = lseek(fd, pos, SEEK_SET);
@@ -1227,7 +1227,7 @@ readv_pos(int fd, off_t pos, const struct iovec *vec, size_t count)
 
 // writev_pos
 ssize_t
-writev_pos(int fd, off_t pos, const struct iovec *vec, size_t count)
+writev_pos(int fd, off_t pos, const struct iovec *vec, int count)
 {
 	// seek
 	off_t result = lseek(fd, pos, SEEK_SET);