diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index 0f985e2..239f186 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -106,6 +106,12 @@
 
 #define RAND_MAX 0x7fffffff
 
+/* Work around x86 libvpx build breakage caused by postproc_x86.c. */
+#if defined(__i386__) && defined(rand)
+#undef rand
+#define __rand lrand48
+#endif
+
 int rand(void);
 int rand_r(unsigned int*);
 void srand(unsigned int);