diff --git a/hw/audio/pcspk.c b/hw/audio/pcspk.c
index dfc7ebca4e..daf92a4ce1 100644
--- a/hw/audio/pcspk.c
+++ b/hw/audio/pcspk.c
@@ -245,18 +245,8 @@ static const TypeInfo pcspk_info = {
     .class_init     = pcspk_class_initfn,
 };
 
-static int pcspk_audio_init_soundhw(ISABus *bus)
-{
-    PCSpkState *s = pcspk_state;
-
-    warn_report("'-soundhw pcspk' is deprecated, "
-                "please set a backend using '-machine pcspk-audiodev=<name>' instead");
-    return pcspk_audio_init(s);
-}
-
 static void pcspk_register(void)
 {
     type_register_static(&pcspk_info);
-    isa_register_soundhw("pcspk", "PC speaker", pcspk_audio_init_soundhw);
 }
 type_init(pcspk_register)
diff --git a/hw/audio/soundhw.c b/hw/audio/soundhw.c
index 173b674ff5..f7d94d7dfa 100644
--- a/hw/audio/soundhw.c
+++ b/hw/audio/soundhw.c
@@ -36,26 +36,12 @@ struct soundhw {
     const char *typename;
     int enabled;
     int isa;
-    union {
-        int (*init_isa) (ISABus *bus);
-        int (*init_pci) (PCIBus *bus);
-    } init;
+    int (*init_pci) (PCIBus *bus);
 };
 
 static struct soundhw soundhw[9];
 static int soundhw_count;
 
-void isa_register_soundhw(const char *name, const char *descr,
-                          int (*init_isa)(ISABus *bus))
-{
-    assert(soundhw_count < ARRAY_SIZE(soundhw) - 1);
-    soundhw[soundhw_count].name = name;
-    soundhw[soundhw_count].descr = descr;
-    soundhw[soundhw_count].isa = 1;
-    soundhw[soundhw_count].init.init_isa = init_isa;
-    soundhw_count++;
-}
-
 void pci_register_soundhw(const char *name, const char *descr,
                           int (*init_pci)(PCIBus *bus))
 {
@@ -63,7 +49,7 @@ void pci_register_soundhw(const char *name, const char *descr,
     soundhw[soundhw_count].name = name;
     soundhw[soundhw_count].descr = descr;
     soundhw[soundhw_count].isa = 0;
-    soundhw[soundhw_count].init.init_pci = init_pci;
+    soundhw[soundhw_count].init_pci = init_pci;
     soundhw_count++;
 }
 
@@ -158,18 +144,13 @@ void soundhw_init(void)
                 } else {
                     pci_create_simple(pci_bus, -1, c->typename);
                 }
-            } else if (c->isa) {
-                if (!isa_bus) {
-                    error_report("ISA bus not available for %s", c->name);
-                    exit(1);
-                }
-                c->init.init_isa(isa_bus);
             } else {
+                assert(!c->isa);
                 if (!pci_bus) {
                     error_report("PCI bus not available for %s", c->name);
                     exit(1);
                 }
-                c->init.init_pci(pci_bus);
+                c->init_pci(pci_bus);
             }
         }
     }
diff --git a/include/hw/audio/soundhw.h b/include/hw/audio/soundhw.h
index f09a297854..e68685fcda 100644
--- a/include/hw/audio/soundhw.h
+++ b/include/hw/audio/soundhw.h
@@ -1,9 +1,6 @@
 #ifndef HW_SOUNDHW_H
 #define HW_SOUNDHW_H
 
-void isa_register_soundhw(const char *name, const char *descr,
-                          int (*init_isa)(ISABus *bus));
-
 void pci_register_soundhw(const char *name, const char *descr,
                           int (*init_pci)(PCIBus *bus));
 void deprecated_register_soundhw(const char *name, const char *descr,