diff --git a/src/cmd/gc/lex.c b/src/cmd/gc/lex.c
index e67f8f572b..51e6534e12 100644
--- a/src/cmd/gc/lex.c
+++ b/src/cmd/gc/lex.c
@@ -807,6 +807,9 @@ tnum:
 		}
 	}
 
+	if(c == 'p')	// 0p begins floating point zero
+		goto casep;
+
 	c1 = 0;
 	for(;;) {
 		if(!isdigit(c))
diff --git a/test/fixedbugs/bug160.dir/x.go b/test/fixedbugs/bug160.dir/x.go
new file mode 100644
index 0000000000..bd52c6cc3c
--- /dev/null
+++ b/test/fixedbugs/bug160.dir/x.go
@@ -0,0 +1,8 @@
+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package x
+
+const Zero = 0.0
+const Ten = 10.0
diff --git a/test/fixedbugs/bug160.dir/y.go b/test/fixedbugs/bug160.dir/y.go
new file mode 100644
index 0000000000..1c8d353d7e
--- /dev/null
+++ b/test/fixedbugs/bug160.dir/y.go
@@ -0,0 +1,19 @@
+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import "os"
+import "x"
+
+func main() {
+	if x.Zero != 0 {
+		println("x.Zero = ", x.Zero);
+		os.Exit(1);
+	}
+	if x.Ten != 10 {
+		println("x.Ten = ", x.Ten);
+		os.Exit(1);
+	}
+}
diff --git a/test/fixedbugs/bug160.go b/test/fixedbugs/bug160.go
new file mode 100644
index 0000000000..0ae9d4ec19
--- /dev/null
+++ b/test/fixedbugs/bug160.go
@@ -0,0 +1,7 @@
+// $G $D/bug160.dir/x.go && $G $D/bug160.dir/y.go && $L y.$A x.$A && ./$A.out
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+nothing to see here