diff --git a/vvp/vpi_signal.cc b/vvp/vpi_signal.cc
index 956e15b3f..dfe454d9c 100644
--- a/vvp/vpi_signal.cc
+++ b/vvp/vpi_signal.cc
@@ -37,6 +37,7 @@
 # include  <malloc.h>
 #endif
 # include  <stdlib.h>
+# include  <limits.h>
 # include  <string.h>
 # include  <assert.h>
 #ifdef CHECK_WITH_VALGRIND