diff --git a/components/heap/heap_caps.c b/components/heap/heap_caps.c
index cb82842f4f..7911702a45 100644
--- a/components/heap/heap_caps.c
+++ b/components/heap/heap_caps.c
@@ -34,22 +34,22 @@ static esp_alloc_failed_hook_t alloc_failed_callback;
 
 
 #ifdef CONFIG_HEAP_ABORT_WHEN_ALLOCATION_FAILS
-IRAM_ATTR static void shex(char buf[8], uint32_t n)
+IRAM_ATTR static void hex_to_str(char buf[8], uint32_t n)
 {
     for (int i = 0; i < 8; i++) {
-        uint8_t b4 = (n >> 28 - (i * 4)) & 0b1111;
-        buf[i] = b4 <= 9 ? '0' + b4 : 'a' + b4 - 10; 
+        uint8_t b4 = (n >> (28 - i * 4)) & 0b1111;
+        buf[i] = b4 <= 9 ? '0' + b4 : 'a' + b4 - 10;
     }
 }
 IRAM_ATTR static void fmt_abort_str(char dest[48], size_t size, uint32_t caps)
 {
     char sSize[8];
     char sCaps[8];
-    shex(sSize,size);
-    shex(sCaps,caps);
+    hex_to_str(sSize, size);
+    hex_to_str(sCaps, caps);
     memcpy(dest, "Mem alloc fail. size 0x00000000 caps 0x00000000", 48);
-    memcpy(dest+23, sSize, 8);
-    memcpy(dest+39, sCaps, 8);
+    memcpy(dest + 23, sSize, 8);
+    memcpy(dest + 39, sCaps, 8);
 }
 #endif