diff --git a/src/cmd/link/internal/loadpe/seh.go b/src/cmd/link/internal/loadpe/seh.go
index 0e2cda21dd..545958f1d6 100644
--- a/src/cmd/link/internal/loadpe/seh.go
+++ b/src/cmd/link/internal/loadpe/seh.go
@@ -16,8 +16,9 @@ import (
 const (
 	UNW_FLAG_EHANDLER  = 1 << 3
 	UNW_FLAG_UHANDLER  = 2 << 3
-	UNW_FLAG_CHAININFO = 3 << 3
-	unwStaticDataSize  = 8
+	UNW_FLAG_CHAININFO = 4 << 3
+	unwStaticDataSize  = 4 // Bytes of unwind data before the variable length part.
+	unwCodeSize        = 2 // Bytes per unwind code.
 )
 
 // processSEH walks all pdata relocations looking for exception handler function symbols.
@@ -81,14 +82,14 @@ func findHandlerInXDataAMD64(ldr *loader.Loader, xsym sym.LoaderSym, add int64)
 		// Nothing to do.
 		return 0
 	}
-	codes := data[3]
+	codes := data[2]
 	if codes%2 != 0 {
 		// There are always an even number of unwind codes, even if the last one is unused.
 		codes += 1
 	}
 	// The exception handler relocation is the first relocation after the unwind codes,
 	// unless it is chained, but we will handle this case later.
-	targetOff := add + unwStaticDataSize*(1+int64(codes))
+	targetOff := add + unwStaticDataSize + unwCodeSize*int64(codes)
 	xrels := ldr.Relocs(xsym)
 	xrelsCount := xrels.Count()
 	idx := sort.Search(xrelsCount, func(i int) bool {