diff --git a/poincare/Makefile b/poincare/Makefile
index 69dfcd8f5..1cf6c7752 100644
--- a/poincare/Makefile
+++ b/poincare/Makefile
@@ -184,6 +184,10 @@ tests_src += $(addprefix poincare/test/,\
   simplification.cpp\
 )
 
+ifeq ($(DEBUG),1)
+POINCARE_TREE_LOG ?= 1
+endif
+
 ifdef POINCARE_TREE_LOG
 SFLAGS += -DPOINCARE_TREE_LOG=1
 endif