diff --git a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
--- a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -2906,6 +2906,7 @@
     {"mte", {AArch64::FeatureMTE}},
     {"memtag", {AArch64::FeatureMTE}},
     {"tlb-rmi", {AArch64::FeatureTLB_RMI}},
+    {"pan", {AArch64::FeaturePAN}},
     {"pan-rwv", {AArch64::FeaturePAN_RWV}},
     {"ccpp", {AArch64::FeatureCCPP}},
     {"rcpc", {AArch64::FeatureRCPC}},
@@ -2921,7 +2922,6 @@
     {"pauth", {AArch64::FeaturePAuth}},
     {"flagm", {AArch64::FeatureFlagM}},
     // FIXME: Unsupported extensions
-    {"pan", {}},
     {"lor", {}},
     {"rdma", {}},
     {"profile", {}},
diff --git a/llvm/test/MC/AArch64/directive-arch_extension.s b/llvm/test/MC/AArch64/directive-arch_extension.s
--- a/llvm/test/MC/AArch64/directive-arch_extension.s
+++ b/llvm/test/MC/AArch64/directive-arch_extension.s
@@ -56,6 +56,10 @@
 tlbi vmalle1os
 // CHECK: tlbi vmalle1os
 
+.arch_extension pan
+mrs x0, pan
+// CHECK: mrs x0, PAN
+
 .arch_extension pan-rwv
 at s1e1wp, x2
 // CHECK: at s1e1wp, x2