diff --git a/platform/mbed_lib.json b/platform/mbed_lib.json
index 9ad37693dd..d0566349e8 100644
--- a/platform/mbed_lib.json
+++ b/platform/mbed_lib.json
@@ -72,7 +72,7 @@
         },
         "error-decode-http-url-str": {
             "help": "HTTP URL string for ARM Mbed-OS Error Decode microsite",
-            "value": "\"\\nFor more info, visit: https:/\\/armmbed.github.io/mbedos-error/?error=0x%08X\""
+            "value": "\"\\nFor more info, visit: https://armmbed.github.io/mbedos-error/?error=0x%08X\""
         }
     },
     "target_overrides": {
diff --git a/tools/toolchains/iar.py b/tools/toolchains/iar.py
index c09a015ec9..b54487869a 100644
--- a/tools/toolchains/iar.py
+++ b/tools/toolchains/iar.py
@@ -167,7 +167,7 @@ class IAR(mbedToolchain):
         opts = ['-D%s' % d for d in defines]
         if for_asm:
             config_macros = self.config.get_config_data_macros()
-            macros_cmd = ['"-D%s"' % d.replace('"', '') for d in config_macros]
+            macros_cmd = ['"-D%s"' % d.replace('"', '').replace('//','/\/') for d in config_macros]
             if self.RESPONSE_FILES:
                 via_file = self.make_option_file(
                     macros_cmd, "asm_macros_{}.xcl")