diff --git a/arch/arm/src/armv7-a/arm_cache.c b/arch/arm/src/armv7-a/arm_cache.c
index c595fcc5b1..bb59ebc4d0 100644
--- a/arch/arm/src/armv7-a/arm_cache.c
+++ b/arch/arm/src/armv7-a/arm_cache.c
@@ -134,7 +134,7 @@ void up_invalidate_icache_all(void)
 
 void up_clean_dcache(uintptr_t start, uintptr_t end)
 {
-  if (cp15_cache_size() < (end - start))
+  if ((end - start) < cp15_cache_size())
     {
       cp15_clean_dcache(start, end);
     }
@@ -198,7 +198,7 @@ void up_clean_dcache_all(void)
 
 void up_flush_dcache(uintptr_t start, uintptr_t end)
 {
-  if (cp15_cache_size() < (end - start))
+  if ((end - start) < cp15_cache_size())
     {
       cp15_flush_dcache(start, end);
     }
diff --git a/arch/arm/src/armv7-r/arm_cache.c b/arch/arm/src/armv7-r/arm_cache.c
index 827d57231c..f1598d174c 100644
--- a/arch/arm/src/armv7-r/arm_cache.c
+++ b/arch/arm/src/armv7-r/arm_cache.c
@@ -134,7 +134,7 @@ void up_invalidate_icache_all(void)
 
 void up_clean_dcache(uintptr_t start, uintptr_t end)
 {
-  if (cp15_cache_size() < (end - start))
+  if ((end - start) < cp15_cache_size())
     {
       cp15_clean_dcache(start, end);
     }
@@ -198,7 +198,7 @@ void up_clean_dcache_all(void)
 
 void up_flush_dcache(uintptr_t start, uintptr_t end)
 {
-  if (cp15_cache_size() < (end - start))
+  if ((end - start) < cp15_cache_size())
     {
       cp15_flush_dcache(start, end);
     }