diff --git a/library/bn_mul.h b/library/bn_mul.h
index a34a7c7d50..b7e9690e92 100644
--- a/library/bn_mul.h
+++ b/library/bn_mul.h
@@ -80,13 +80,12 @@
 
 #endif /* bits in mbedtls_mpi_uint */
 
+/* *INDENT-OFF* */
 #if defined(MBEDTLS_HAVE_ASM)
 
-/* *INDENT-OFF* */
 #ifndef asm
 #define asm __asm
 #endif
-/* *INDENT-ON* */
 
 /* armcc5 --gnu defines __GNUC__ but doesn't support GNU's extended asm */
 #if defined(__GNUC__) && \
@@ -1073,4 +1072,5 @@
 #define MULADDC_X8_CORE MULADDC_X4_CORE MULADDC_X4_CORE
 #endif /* MULADDC_X8_CORE */
 
+/* *INDENT-ON* */
 #endif /* bn_mul.h */
diff --git a/scripts/code_style.py b/scripts/code_style.py
index 8e82b93fb0..aae3e24925 100755
--- a/scripts/code_style.py
+++ b/scripts/code_style.py
@@ -106,8 +106,12 @@ def check_style_is_correct(src_file_list: List[str]) -> bool:
     style_correct = True
     for src_file in src_file_list:
         uncrustify_cmd = [UNCRUSTIFY_EXE] + UNCRUSTIFY_ARGS + [src_file]
-        subprocess.run(uncrustify_cmd, stdout=subprocess.PIPE, \
+        result = subprocess.run(uncrustify_cmd, stdout=subprocess.PIPE, \
                 stderr=subprocess.PIPE, check=False)
+        if result.returncode != 0:
+            print_err("Uncrustify returned " + str(result.returncode) + \
+                    " correcting file " + src_file)
+            return False
 
         # Uncrustify makes changes to the code and places the result in a new
         # file with the extension ".uncrustify". To get the changes (if any)
@@ -128,22 +132,30 @@ def check_style_is_correct(src_file_list: List[str]) -> bool:
 
     return style_correct
 
-def fix_style_single_pass(src_file_list: List[str]) -> None:
+def fix_style_single_pass(src_file_list: List[str]) -> bool:
     """
     Run Uncrustify once over the source files.
     """
     code_change_args = UNCRUSTIFY_ARGS + ["--no-backup"]
     for src_file in src_file_list:
         uncrustify_cmd = [UNCRUSTIFY_EXE] + code_change_args + [src_file]
-        subprocess.run(uncrustify_cmd, check=False, stdout=STDOUT_UTF8, \
-                stderr=STDERR_UTF8)
+        result = subprocess.run(uncrustify_cmd, check=False, \
+                stdout=STDOUT_UTF8, stderr=STDERR_UTF8)
+        if result.returncode != 0:
+            print_err("Uncrustify with file returned: " + \
+                    str(result.returncode) + " correcting file " + \
+                    src_file)
+            return False
+    return True
 
 def fix_style(src_file_list: List[str]) -> int:
     """
     Fix the code style. This takes 2 passes of Uncrustify.
     """
-    fix_style_single_pass(src_file_list)
-    fix_style_single_pass(src_file_list)
+    if not fix_style_single_pass(src_file_list):
+        return 1
+    if not fix_style_single_pass(src_file_list):
+        return 1
 
     # Guard against future changes that cause the codebase to require
     # more passes.