diff --git a/src/Makefile.am b/src/Makefile.am
index a19fd2cc..7d2c2d90 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,19 +1,24 @@
 SUBDIRS	= jansson-2.6
 
 ACLOCAL_AMFLAGS = -I m4
+JANSSON_CPPFLAGS= -I$(top_builddir)/src/jansson-2.6/src -I$(top_srcdir)/src/jansson-2.6/src
 
 lib_LTLIBRARIES = libckpool.la
+libckpool_la_CPPFLAGS = $(JANSSON_CPPFLAGS)
 libckpool_la_SOURCES = libckpool.c libckpool.h sha2.c sha2.h
 libckpool_la_LIBADD = @PTHREAD_LIBS@ @MATH_LIBS@ @RT_LIBS@
 
 bin_PROGRAMS = ckpool ckpmsg ckdb
+ckpool_CPPFLAGS = $(JANSSON_CPPFLAGS)
 ckpool_SOURCES = ckpool.c ckpool.h generator.c generator.h bitcoin.c bitcoin.h \
 		 stratifier.c stratifier.h connector.c connector.h uthash.h \
 		 utlist.h
 ckpool_LDADD = libckpool.la @JANSSON_LIBS@
 
+ckpmsg_CPPFLAGS = $(JANSSON_CPPFLAGS)
 ckpmsg_SOURCES = ckpmsg.c
 ckpmsg_LDADD = libckpool.la @JANSSON_LIBS@
 
+ckdb_CPPFLAGS = $(JANSSON_CPPFLAGS)
 ckdb_SOURCES = ckdb.c klist.c ktree.c klist.h ktree.h
 ckdb_LDADD = libckpool.la @JANSSON_LIBS@ @PQ_LIBS@