diff --git a/arch/arm/src/stm32/stm32_allocateheap.c b/arch/arm/src/stm32/stm32_allocateheap.c
index 945e4faffb..3ead08e804 100644
--- a/arch/arm/src/stm32/stm32_allocateheap.c
+++ b/arch/arm/src/stm32/stm32_allocateheap.c
@@ -188,7 +188,7 @@
        /* Only one memory region.  Force Configuration 1 */
 
 #      ifndef CONFIG_STM32_CCMEXCLUDE
-#        if CONFIG_STM32_HAVE_CCM
+#        ifdef CONFIG_STM32_HAVE_CCM
 #          warning "CCM SRAM excluded from the heap"
 #        endif
 #        define CONFIG_STM32_CCMEXCLUDE 1