diff --git a/cpu/stm32/stm32_mem_lengths.mk b/cpu/stm32/stm32_mem_lengths.mk
index 63006679a6..d26166a55b 100644
--- a/cpu/stm32/stm32_mem_lengths.mk
+++ b/cpu/stm32/stm32_mem_lengths.mk
@@ -188,7 +188,9 @@ ifeq ($(STM32_TYPE), F)
   endif
 else ifeq ($(STM32_TYPE), G)
   ifeq ($(STM32_FAMILY), 0)
-    ifneq (, $(filter $(STM32_MODEL2), 7))
+    ifneq (, $(filter $(STM32_MODEL2), B))
+      RAM_LEN = 144K
+    else ifneq (, $(filter $(STM32_MODEL2), 7))
       RAM_LEN = 36K
     else ifneq (, $(filter $(STM32_MODEL2), 3))
       RAM_LEN = 8K