diff --git a/libveriuser/Makefile.in b/libveriuser/Makefile.in
index bdc09330f..989d7c980 100644
--- a/libveriuser/Makefile.in
+++ b/libveriuser/Makefile.in
@@ -47,7 +47,7 @@ LDRELOCFLAGS = @LDRELOCFLAGS@
 
 LDTARGETFLAGS = @LDTARGETFLAGS@
 
-CPPFLAGS = $(INCLUDE_PATH) @CPPFLAGS@ @DEFS@ @PICFLAG@
+CPPFLAGS = $(INCLUDE_PATH) @CPPFLAGS@ @DEFS@ -DICARUS_VPI_CONST=const @PICFLAG@
 CFLAGS = @WARNING_FLAGS@ @WARNING_FLAGS_CC@ @CFLAGS@
 
 A = a_close.o a_compare_handles.o a_configure.o a_fetch_argc.o \
diff --git a/vpi/Makefile.in b/vpi/Makefile.in
index cf62786e2..a2ee88145 100644
--- a/vpi/Makefile.in
+++ b/vpi/Makefile.in
@@ -45,7 +45,7 @@ else
 INCLUDE_PATH = -I. -I.. -I$(srcdir) -I$(srcdir)/..
 endif
 
-CPPFLAGS = $(INCLUDE_PATH) @file64_support@ @CPPFLAGS@ @DEFS@ @PICFLAG@
+CPPFLAGS = $(INCLUDE_PATH) @file64_support@ @CPPFLAGS@ @DEFS@ -DICARUS_VPI_CONST=const @PICFLAG@
 CFLAGS = @WARNING_FLAGS@ @WARNING_FLAGS_CC@ @CFLAGS@
 CXXFLAGS = @WARNING_FLAGS@ @WARNING_FLAGS_CXX@ @CXXFLAGS@
 LDFLAGS = @LDFLAGS@
diff --git a/vvp/Makefile.in b/vvp/Makefile.in
index faae3736a..d5a1c7f92 100644
--- a/vvp/Makefile.in
+++ b/vvp/Makefile.in
@@ -55,7 +55,7 @@ else
 INCLUDE_PATH = -I. -I.. -I$(srcdir) -I$(srcdir)/..
 endif
 
-CPPFLAGS = $(INCLUDE_PATH) @CPPFLAGS@ @DEFS@
+CPPFLAGS = $(INCLUDE_PATH) @CPPFLAGS@ @DEFS@ -DICARUS_VPI_CONST=const
 CFLAGS = @WARNING_FLAGS@ @WARNING_FLAGS_CC@ @CFLAGS@
 CXXFLAGS = @WARNING_FLAGS@ @WARNING_FLAGS_CXX@ @CXXFLAGS@
 LDFLAGS = @rdynamic@ @LDFLAGS@