diff --git a/tools/prelink-riscv.c b/tools/prelink-riscv.c
index b0467949eb..43d6412ee9 100644
--- a/tools/prelink-riscv.c
+++ b/tools/prelink-riscv.c
@@ -118,5 +118,7 @@ int main(int argc, const char *const *argv)
 			prelink_le32(data);
 	}
 
+	munmap(data, st.st_size);
+
 	return 0;
 }