diff --git a/programs/util/strerror.c b/programs/util/strerror.c
index dda6916..c15904f 100644
--- a/programs/util/strerror.c
+++ b/programs/util/strerror.c
@@ -20,69 +20,68 @@
 #include "mbedtls/build_info.h"
 
 #if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
+#    include "mbedtls/platform.h"
 #else
-#include <stdio.h>
-#include <stdlib.h>
-#define mbedtls_printf     printf
-#define mbedtls_exit       exit
+#    include <stdio.h>
+#    include <stdlib.h>
+#    define mbedtls_printf printf
+#    define mbedtls_exit   exit
 #endif
 
 #if defined(MBEDTLS_ERROR_C) || defined(MBEDTLS_ERROR_STRERROR_DUMMY)
-#include "mbedtls/error.h"
+#    include "mbedtls/error.h"
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#    include <stdio.h>
+#    include <stdlib.h>
+#    include <string.h>
 #endif
 
-#define USAGE \
+#define USAGE                          \
     "\n usage: strerror <errorcode>\n" \
     "\n where <errorcode> can be a decimal or hexadecimal (starts with 0x or -0x)\n"
 
 #if !defined(MBEDTLS_ERROR_C) && !defined(MBEDTLS_ERROR_STRERROR_DUMMY)
-int main( void )
+int main(void)
 {
-    mbedtls_printf("MBEDTLS_ERROR_C and/or MBEDTLS_ERROR_STRERROR_DUMMY not defined.\n");
-    mbedtls_exit( 0 );
+    mbedtls_printf(
+        "MBEDTLS_ERROR_C and/or MBEDTLS_ERROR_STRERROR_DUMMY not defined.\n");
+    mbedtls_exit(0);
 }
 #else
-int main( int argc, char *argv[] )
+int main(int argc, char *argv[])
 {
     long int val;
     char *end = argv[1];
 
-    if( argc != 2 )
-    {
-        mbedtls_printf( USAGE );
-        mbedtls_exit( 0 );
+    if (argc != 2) {
+        mbedtls_printf(USAGE);
+        mbedtls_exit(0);
     }
 
-    val = strtol( argv[1], &end, 10 );
-    if( *end != '\0' )
-    {
-        val = strtol( argv[1], &end, 16 );
-        if( *end != '\0' )
-        {
-            mbedtls_printf( USAGE );
-            return 0 ;
+    val = strtol(argv[1], &end, 10);
+    if (*end != '\0') {
+        val = strtol(argv[1], &end, 16);
+        if (*end != '\0') {
+            mbedtls_printf(USAGE);
+            return 0;
         }
     }
-    if( val > 0 )
+    if (val > 0)
         val = -val;
 
-    if( val != 0 )
-    {
+    if (val != 0) {
         char error_buf[200];
-        mbedtls_strerror( val, error_buf, 200 );
-        mbedtls_printf("Last error was: -0x%04x - %s\n\n", (unsigned int) -val, error_buf );
+        mbedtls_strerror(val, error_buf, 200);
+        mbedtls_printf("Last error was: -0x%04x - %s\n\n", (unsigned int)-val,
+                       error_buf);
     }
 
-#if defined(_WIN32)
-    mbedtls_printf( "  + Press Enter to exit this program.\n" );
-    fflush( stdout ); getchar();
-#endif
+#    if defined(_WIN32)
+    mbedtls_printf("  + Press Enter to exit this program.\n");
+    fflush(stdout);
+    getchar();
+#    endif
 
-    mbedtls_exit( val );
+    mbedtls_exit(val);
 }
 #endif /* MBEDTLS_ERROR_C */