diff --git a/tgt-vhdl/Makefile.in b/tgt-vhdl/Makefile.in
index d7e32fc0e..e0c02a65f 100644
--- a/tgt-vhdl/Makefile.in
+++ b/tgt-vhdl/Makefile.in
@@ -38,7 +38,7 @@ INSTALL = @INSTALL@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
 INSTALL_DATA = @INSTALL_DATA@
 
-CPPFLAGS = -I. -I$(srcdir)/.. -DVERSION='"$(VERSION)"' @CPPFLAGS@ @DEFS@ @PICFLAG@
+CPPFLAGS = -I. -I.. -I$(srcdir)/.. -DVERSION='"$(VERSION)"' @CPPFLAGS@ @DEFS@ @PICFLAG@
 CXXFLAGS = -Wall @CXXFLAGS@
 LDFLAGS = @LDFLAGS@
 
diff --git a/tgt-vvp/Makefile.in b/tgt-vvp/Makefile.in
index 476b4458d..a03ed93ec 100644
--- a/tgt-vvp/Makefile.in
+++ b/tgt-vvp/Makefile.in
@@ -40,7 +40,7 @@ INSTALL = @INSTALL@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
 INSTALL_DATA = @INSTALL_DATA@
 
-CPPFLAGS = -I. -I$(srcdir)/.. -DVERSION='"$(VERSION)"' @CPPFLAGS@ @DEFS@ @PICFLAG@
+CPPFLAGS = -I. -I.. -I$(srcdir)/.. -DVERSION='"$(VERSION)"' @CPPFLAGS@ @DEFS@ @PICFLAG@
 CFLAGS = -Wall @CFLAGS@
 LDFLAGS = @LDFLAGS@