diff --git a/coregrind/m_libcprint.c b/coregrind/m_libcprint.c
index f4ca698..b4bdda3 100644
--- a/coregrind/m_libcprint.c
+++ b/coregrind/m_libcprint.c
@@ -34,6 +34,7 @@
 #include "pub_core_libcassert.h"
 #include "pub_core_libcfile.h"
 #include "pub_core_libcprint.h"
+#include "pub_core_libcproc.h"
 #include "pub_core_options.h"
 #include "valgrind.h"           // for RUNNING_ON_VALGRIND