diff --git a/cpp/piscsi/piscsi_core.cpp b/cpp/piscsi/piscsi_core.cpp
index ff6ecc18..c5391ce0 100644
--- a/cpp/piscsi/piscsi_core.cpp
+++ b/cpp/piscsi/piscsi_core.cpp
@@ -157,7 +157,6 @@ void Piscsi::TerminationHandler(int)
 Piscsi::optargs_type Piscsi::ParseArguments(const vector<char *>& args, int& port) const
 {
 	optargs_type optargs;
-	int block_size = 0;
 	string name;
 
 	opterr = 1;
@@ -168,6 +167,7 @@ Piscsi::optargs_type Piscsi::ParseArguments(const vector<char *>& args, int& por
 			// the 'bus' object is created and configured
 			case 'i':
 			case 'I':
+			case 'b':
 			case 'd':
 			case 'D':
 			case 'R':
@@ -182,13 +182,6 @@ Piscsi::optargs_type Piscsi::ParseArguments(const vector<char *>& args, int& por
 				continue;
 			}
 
-			case 'b': {
-				if (!GetAsUnsignedInt(optarg, block_size)) {
-					throw parser_exception("Invalid block size " + string(optarg));
-				}
-				continue;
-			}
-
 			case 'L':
 				current_log_level = optarg;
 				continue;
@@ -220,7 +213,7 @@ Piscsi::optargs_type Piscsi::ParseArguments(const vector<char *>& args, int& por
 		}
 
 		if (optopt) {
-			throw parser_exception("Praser error");
+			throw parser_exception("Parser error");
 		}
 	}
 
@@ -253,6 +246,12 @@ void Piscsi::CreateInitialDevices(const optargs_type& optargs) const
 				id_and_lun = value;
 				continue;
 
+			case 'b':
+				if (!GetAsUnsignedInt(value, block_size)) {
+					throw parser_exception("Invalid block size " + value);
+				}
+				continue;
+
 			case 'z':
 				locale = value.c_str();
 				continue;