diff --git a/configure b/configure
index 08392c9..26a35ce 100755
--- a/configure
+++ b/configure
@@ -20245,7 +20245,7 @@
 $as_echo_n "checking for and configuring mib modules to use... " >&6; }
 
 # set up the CPP command
-MODULECPP="$CPP $PARTIALTARGETFLAGS -DNETSNMP_FEATURE_CHECKING -I${srcdir}/include -I${srcdir}/agent/mibgroup"
+MODULECPP="$CPP $PARTIALTARGETFLAGS $CPPFLAGS -DNETSNMP_FEATURE_CHECKING -I${srcdir}/include -I${srcdir}/agent/mibgroup"
 if test "x$enable_mfd_rewrites" = "xyes"; then
   MODULECPP="$MODULECPP -DNETSNMP_ENABLE_MFD_REWRITES"
 fi
diff --git a/configure.d/config_modules_agent b/configure.d/config_modules_agent
index 60b119b..7e29255 100644
--- a/configure.d/config_modules_agent
+++ b/configure.d/config_modules_agent
@@ -28,7 +28,7 @@
 AC_MSG_CHECKING([for and configuring mib modules to use])
 
 # set up the CPP command
-MODULECPP="$CPP $PARTIALTARGETFLAGS -DNETSNMP_FEATURE_CHECKING -I${srcdir}/include -I${srcdir}/agent/mibgroup"
+MODULECPP="$CPP $PARTIALTARGETFLAGS $CPPFLAGS -DNETSNMP_FEATURE_CHECKING -I${srcdir}/include -I${srcdir}/agent/mibgroup"
 if test "x$enable_mfd_rewrites" = "xyes"; then
   MODULECPP="$MODULECPP -DNETSNMP_ENABLE_MFD_REWRITES"
 fi