diff --git a/lib/Target/PTX/PTXAsmPrinter.cpp b/lib/Target/PTX/PTXAsmPrinter.cpp
index cd82d568b38..c1a002c2441 100644
--- a/lib/Target/PTX/PTXAsmPrinter.cpp
+++ b/lib/Target/PTX/PTXAsmPrinter.cpp
@@ -480,7 +480,7 @@ void PTXAsmPrinter::EmitVariableDeclaration(const GlobalVariable *gv) {
   unsigned alignment = gv->getAlignment();
   if (alignment != 0) {
     decl += ".align ";
-    decl += utostr(Log2_32(gv->getAlignment()));
+    decl += utostr(std::max(1U, Log2_32(gv->getAlignment())));
     decl += " ";
   }