diff --git a/clients/tui/newt/Makefile.am b/clients/tui/newt/Makefile.am
index dcc02ab726..4633212ce4 100644
--- a/clients/tui/newt/Makefile.am
+++ b/clients/tui/newt/Makefile.am
@@ -1,6 +1,7 @@
 AM_CPPFLAGS= \
 	-I$(top_srcdir)/include \
 	-I$(top_srcdir)/libnm-core \
+	-I$(top_builddir)/libnm-core \
 	-DG_LOG_DOMAIN=\""nmtui"\" \
 	$(GLIB_CFLAGS) \
 	$(NEWT_CFLAGS) \
diff --git a/src/Makefile.am b/src/Makefile.am
index e92d9f7506..d8e9327a3b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -61,6 +61,7 @@ SYSTEMD_NM_CFLAGS = \
 	-I$(top_srcdir)/src/systemd/src/shared \
 	-I$(top_srcdir)/src/systemd \
 	-I$(top_srcdir)/libnm-core \
+	-I$(top_builddir)/libnm-core \
 	-DNETWORKMANAGER_COMPILATION=NM_NETWORKMANAGER_COMPILATION_INSIDE_DAEMON
 
 libsystemd_nm_la_SOURCES = \
diff --git a/src/dhcp-manager/Makefile.am b/src/dhcp-manager/Makefile.am
index 332f2d3a40..32668d8dbc 100644
--- a/src/dhcp-manager/Makefile.am
+++ b/src/dhcp-manager/Makefile.am
@@ -6,6 +6,7 @@ nm_dhcp_helper_CPPFLAGS = \
 	$(GLIB_CFLAGS) \
 	-I$(top_srcdir)/include \
 	-I$(top_srcdir)/libnm-core \
+	-I$(top_builddir)/libnm-core \
 	-DG_LOG_DOMAIN=\""nm-dhcp-helper"\" \
 	-DNM_VERSION_MAX_ALLOWED=NM_VERSION_NEXT_STABLE \
 	-DNMRUNDIR=\"$(nmrundir)\"