--- a/subprojects/frida-gum/subprojects/libunwind/src/x86_64/unwind_i.h
+++ b/subprojects/frida-gum/subprojects/libunwind/src/x86_64/unwind_i.h
@@ -82,6 +82,7 @@
 
 /* A macro to pop n shadow stack frames without creating a new frame.  */
 #if defined __CET__ && (__CET__ & 2) != 0
+# include <immintrin.h>
 # define POP_SHADOW_STACK_FRAMES(n)            \
   do                                           \
     {                                          \