diff --git a/include/unicorn/x86.h b/include/unicorn/x86.h
index fe33c723..b0e02d8d 100644
--- a/include/unicorn/x86.h
+++ b/include/unicorn/x86.h
@@ -8,6 +8,8 @@
 extern "C" {
 #endif
 
+#include <stdint.h>
+
 // Memory-Management Register for instructions IDTR, GDTR, LDTR, TR.
 // Borrow from SegmentCache in qemu/target-i386/cpu.h
 typedef struct uc_x86_mmr {