diff --git a/debian/rules b/debian/rules
index aee2b17..76aeeae 100755
--- a/debian/rules
+++ b/debian/rules
@@ -6,6 +6,8 @@ include /usr/share/cdbs/1/class/cmake.mk
 DEB_SRCDIR=astroberry-piface
 DEB_DH_SHLIBDEPS_ARGS=-u--ignore-missing-info
 
+DEB_CMAKE_EXTRA_FLAGS += -DCMAKE_BUILD_TYPE=Debug
+
 NO_CPUS=$(shell nproc)
 ifeq ($(NO_CPUS),0)
 NO_CPUS=1