diff --git a/dirmngr/Makefile.am b/dirmngr/Makefile.am
index 34f2c5d3d..b404165ed 100644
--- a/dirmngr/Makefile.am
+++ b/dirmngr/Makefile.am
@@ -143,7 +143,7 @@ endif
 t_http_SOURCES = $(t_common_src) t-http.c http.c dns-stuff.c http-common.c
 t_http_CFLAGS  = -DWITHOUT_NPTH=1  $(USE_C99_CFLAGS) \
 	         $(LIBGCRYPT_CFLAGS) $(NTBTLS_CFLAGS) $(LIBGNUTLS_CFLAGS) \
-                 $(GPG_ERROR_CFLAGS) $(KSBA_CFLAGS)
+                 $(LIBASSUAN_CFLAGS) $(GPG_ERROR_CFLAGS) $(KSBA_CFLAGS)
 t_http_LDADD   = $(t_common_ldadd) \
 	         $(NTBTLS_LIBS) $(KSBA_LIBS) $(LIBGNUTLS_LIBS) $(DNSLIBS)
 
@@ -152,11 +152,13 @@ t_ldap_parse_uri_SOURCES = \
         http.c http-common.c dns-stuff.c \
         $(ldap_url) $(t_common_src)
 t_ldap_parse_uri_CFLAGS = -DWITHOUT_NPTH=1  $(USE_C99_CFLAGS) \
-			  $(LIBGCRYPT_CFLAGS) $(GPG_ERROR_CFLAGS)
+			  $(LIBGCRYPT_CFLAGS) \
+                          $(LIBASSUAN_CFLAGS) $(GPG_ERROR_CFLAGS)
 t_ldap_parse_uri_LDADD = $(ldaplibs) $(t_common_ldadd) $(DNSLIBS)
 
 t_dns_stuff_CFLAGS = -DWITHOUT_NPTH=1  $(USE_C99_CFLAGS) \
-		     $(LIBGCRYPT_CFLAGS) $(GPG_ERROR_CFLAGS)
+		     $(LIBGCRYPT_CFLAGS) \
+	             $(LIBASSUAN_CFLAGS) $(GPG_ERROR_CFLAGS)
 t_dns_stuff_SOURCES = $(t_common_src) t-dns-stuff.c dns-stuff.c
 t_dns_stuff_LDADD   = $(t_common_ldadd) $(DNSLIBS)