diff --git a/poincare/Makefile b/poincare/Makefile
index 1cf6c7752..bac81600c 100644
--- a/poincare/Makefile
+++ b/poincare/Makefile
@@ -189,5 +189,5 @@ POINCARE_TREE_LOG ?= 1
 endif
 
 ifdef POINCARE_TREE_LOG
-SFLAGS += -DPOINCARE_TREE_LOG=1
+SFLAGS += -DPOINCARE_TREE_LOG=$(POINCARE_TREE_LOG)
 endif