diff --git a/src/coff/coff.c b/src/coff/coff.c
index 64f8dbcd..cd4f82cc 100644
--- a/src/coff/coff.c
+++ b/src/coff/coff.c
@@ -28,7 +28,7 @@ coff_is_obj(String8 data)
     switch (header->machine) {
       case COFF_MachineType_UNKNOWN:
       case COFF_MachineType_X86:    case COFF_MachineType_X64:
-      case COFF_MachineType_ARM33:  case COFF_MachineType_ARM:
+      case COFF_MachineType_AM33:   case COFF_MachineType_ARM:
       case COFF_MachineType_ARM64:  case COFF_MachineType_ARMNT:
       case COFF_MachineType_EBC:    case COFF_MachineType_IA64:
       case COFF_MachineType_M32R:   case COFF_MachineType_MIPS16:
@@ -1014,7 +1014,7 @@ coff_string_from_machine_type(COFF_MachineType machine)
     case COFF_MachineType_UNKNOWN:   result = str8_lit("UNKNOWN");   break;
     case COFF_MachineType_X86:       result = str8_lit("X86");       break;
     case COFF_MachineType_X64:       result = str8_lit("X64");       break;
-    case COFF_MachineType_ARM33:     result = str8_lit("ARM33");     break;
+    case COFF_MachineType_AM33:      result = str8_lit("AM33");      break;
     case COFF_MachineType_ARM:       result = str8_lit("ARM");       break;
     case COFF_MachineType_ARM64:     result = str8_lit("ARM64");     break;
     case COFF_MachineType_ARMNT:     result = str8_lit("ARMNT");     break;
diff --git a/src/coff/coff.h b/src/coff/coff.h
index abe1efa2..7d2b9aa6 100644
--- a/src/coff/coff.h
+++ b/src/coff/coff.h
@@ -48,7 +48,7 @@ enum
   COFF_MachineType_UNKNOWN             = 0x0,
   COFF_MachineType_X86                 = 0x14c,
   COFF_MachineType_X64                 = 0x8664,
-  COFF_MachineType_ARM33               = 0x1d3,
+  COFF_MachineType_AM33                = 0x1d3,
   COFF_MachineType_ARM                 = 0x1c0,
   COFF_MachineType_ARM64               = 0xaa64,
   COFF_MachineType_ARMNT               = 0x1c4,