diff --git a/src/runtime/sigtab_linux_generic.go b/src/runtime/sigtab_linux_generic.go
index b26040b80317db..38d686544fde9b 100644
--- a/src/runtime/sigtab_linux_generic.go
+++ b/src/runtime/sigtab_linux_generic.go
@@ -45,7 +45,7 @@ var sigtable = [...]sigTabT{
 	/* 31 */ {_SigThrow, "SIGSYS: bad system call"},
 	/* 32 */ {_SigSetStack + _SigUnblock, "signal 32"}, /* SIGCANCEL; see issue 6997 */
 	/* 33 */ {_SigSetStack + _SigUnblock, "signal 33"}, /* SIGSETXID; see issues 3871, 9400, 12498 */
-	/* 34 */ {_SigNotify, "signal 34"},
+	/* 34 */ {_SigSetStack + _SigUnblock, "signal 34"}, /* musl SIGSYNCCALL; see issue 39343 */
 	/* 35 */ {_SigNotify, "signal 35"},
 	/* 36 */ {_SigNotify, "signal 36"},
 	/* 37 */ {_SigNotify, "signal 37"},
diff --git a/src/runtime/sigtab_linux_mipsx.go b/src/runtime/sigtab_linux_mipsx.go
index 81dd2314c56610..51ef470ce7ac1e 100644
--- a/src/runtime/sigtab_linux_mipsx.go
+++ b/src/runtime/sigtab_linux_mipsx.go
@@ -42,7 +42,7 @@ var sigtable = [...]sigTabT{
 	/*  31 */ {_SigNotify, "SIGXFSZ: file size limit exceeded"},
 	/*  32 */ {_SigSetStack + _SigUnblock, "signal 32"}, /* SIGCANCEL; see issue 6997 */
 	/*  33 */ {_SigSetStack + _SigUnblock, "signal 33"}, /* SIGSETXID; see issues 3871, 9400, 12498 */
-	/*  34 */ {_SigNotify, "signal 34"},
+	/*  34 */ {_SigSetStack + _SigUnblock, "signal 34"}, /* musl SIGSYNCCALL; see issue 39343 */
 	/*  35 */ {_SigNotify, "signal 35"},
 	/*  36 */ {_SigNotify, "signal 36"},
 	/*  37 */ {_SigNotify, "signal 37"},