diff --git a/src/etc/gen-intrinsics b/src/etc/gen-intrinsics
index 660c367991b..72785bfbbf6 100755
--- a/src/etc/gen-intrinsics
+++ b/src/etc/gen-intrinsics
@@ -14,7 +14,7 @@ do
     fi
 
     clang++ -emit-llvm -S -m$BITS -O3 -Isrc/rt/isaac -Isrc/rt/uthash \
-        -Isrc/rt/arch/$ARCH -fno-stack-protector \
+        -Isrc/rt/arch/$ARCH -Isrc/rt -fno-stack-protector \
         -o src/rt/intrinsics/intrinsics.$ARCH.ll.in \
         src/rt/intrinsics/intrinsics.cpp
     sed -i .orig \
diff --git a/src/rt/intrinsics/intrinsics.cpp b/src/rt/intrinsics/intrinsics.cpp
index 2e897bce797..8a99e6a4946 100644
--- a/src/rt/intrinsics/intrinsics.cpp
+++ b/src/rt/intrinsics/intrinsics.cpp
@@ -4,6 +4,7 @@
 // Build with the script in src/etc/gen-intrinsics
 
 #include "../rust_internal.h"
+#include "../rust_util.h"
 #include "../rust_scheduler.h"
 #include <cstdlib>
 #include <cstring>