diff --git a/Configuration/UTMConfiguration+Defaults.m b/Configuration/UTMConfiguration+Defaults.m
index 2952f921d..238e9c115 100644
--- a/Configuration/UTMConfiguration+Defaults.m
+++ b/Configuration/UTMConfiguration+Defaults.m
@@ -55,6 +55,8 @@ - (void)loadDefaultsForTarget:(NSString *)target {
         self.shareClipboardEnabled = YES;
     } else if ([target isEqualToString:@"mac99"]) {
         self.soundEnabled = NO;
+    } else if ([target isEqualToString:@"isapc"]) {
+        self.inputLegacy = YES; // no USB support
     }
     NSString *machineProp = [UTMConfiguration defaultMachinePropertiesForTarget:target];
     if (machineProp) {
diff --git a/Managers/UTMQemuSystem.m b/Managers/UTMQemuSystem.m
index a319b1d96..8bd559d7b 100644
--- a/Managers/UTMQemuSystem.m
+++ b/Managers/UTMQemuSystem.m
@@ -41,6 +41,7 @@ @interface UTMQemuSystem ()
 @property (nonatomic, readonly) CPUCount emulatedCpuCount;
 @property (nonatomic, readonly) BOOL useHypervisor;
 @property (nonatomic, readonly) BOOL hasCustomBios;
+@property (nonatomic, readonly) BOOL usbSupported;
 
 @end
 
@@ -411,6 +412,10 @@ - (BOOL)hasCustomBios {
     return NO;
 }
 
+- (BOOL)usbSupported {
+    return ![self.configuration.systemTarget isEqualToString:@"isapc"];
+}
+
 - (NSString *)machineProperties {
     if (self.configuration.systemMachineProperties.length > 0) {
         return self.configuration.systemMachineProperties; // use specified properties
@@ -482,7 +487,9 @@ - (void)argsFromConfiguration {
     }
     [self pushArgv:@"-name"];
     [self pushArgv:self.configuration.name];
-    [self argsForUsb];
+    if (self.usbSupported) {
+        [self argsForUsb];
+    }
     [self argsForDrives];
     [self argsForNetwork];
     if (self.snapshot) {