diff --git a/crash_reporter/user_collector.cc b/crash_reporter/user_collector.cc
index 4afad4356..f6841e623 100644
--- a/crash_reporter/user_collector.cc
+++ b/crash_reporter/user_collector.cc
@@ -107,7 +107,7 @@ std::string UserCollector::GetPattern(bool enabled) const {
     // the size of the invocation line for crash_reporter, since the kernel
     // has a fixed-sized (128B) buffer for it (before parameter expansion).
     // Note that the kernel does not support quoted arguments in core_pattern.
-    return StringPrintf("|%s --user=%%p:%%s:%%u:%%e", our_path_.c_str());
+    return StringPrintf("|%s --user=%%P:%%s:%%u:%%e", our_path_.c_str());
   } else {
     return "core";
   }
diff --git a/crash_reporter/user_collector_test.cc b/crash_reporter/user_collector_test.cc
index d416a7bbd..eed6dafa0 100644
--- a/crash_reporter/user_collector_test.cc
+++ b/crash_reporter/user_collector_test.cc
@@ -71,7 +71,7 @@ class UserCollectorTest : public ::testing::Test {
 
 TEST_F(UserCollectorTest, EnableOK) {
   ASSERT_TRUE(collector_.Enable());
-  ExpectFileEquals("|/my/path --user=%p:%s:%u:%e", "test/core_pattern");
+  ExpectFileEquals("|/my/path --user=%P:%s:%u:%e", "test/core_pattern");
   ExpectFileEquals("4", "test/core_pipe_limit");
   ASSERT_EQ(s_crashes, 0);
   EXPECT_TRUE(FindLog("Enabling user crash handling"));