diff --git a/tests/scripts/generate_code.pl b/tests/scripts/generate_code.pl
index 49af2db7f..84e949dfa 100755
--- a/tests/scripts/generate_code.pl
+++ b/tests/scripts/generate_code.pl
@@ -256,7 +256,7 @@ while($test_cases =~ /\/\* BEGIN_CASE *([\w:]*) \*\/\n(.*?)\n\/\* END_CASE \*\//
             $param_defs .= "    char *param$i = params[$i];\n";
             $param_checks .= "    if( verify_string( &param$i ) != 0 ) return( DISPATCH_INVALID_TEST_DATA );\n";
             push @dispatch_params, "param$i";
-            $mapping_regex .= ":[^:\n]+";
+            $mapping_regex .= ":(?:\\\\.|[^:\n])+";
         }
         else
         {
diff --git a/tests/suites/test_suite_pem.data b/tests/suites/test_suite_pem.data
index 9a62db8ea..339b4d3f8 100644
--- a/tests/suites/test_suite_pem.data
+++ b/tests/suites/test_suite_pem.data
@@ -17,10 +17,10 @@ PEM write (exactly two lines + 1)
 mbedtls_pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F00":"-----START TEST-----\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAA==\n-----END TEST-----\n"
 
 PEM read (DES-EDE3-CBC + invalid iv)
-mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,00$":-4608
+mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,00$":MBEDTLS_ERR_PEM_INVALID_ENC_IV
 
 PEM read (DES-CBC + invalid iv)
-mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,00$":-4608
+mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-CBC,00$":MBEDTLS_ERR_PEM_INVALID_ENC_IV
 
 PEM read (unknown encryption algorithm)
-mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-,00$":-4736
+mbedtls_pem_read_buffer:"^":"$":"^\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-,00$":MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG