diff --git a/js/src/jit/JitOptions.cpp b/js/src/jit/JitOptions.cpp
index 8d43464ad5f..ae5723cada1 100644
--- a/js/src/jit/JitOptions.cpp
+++ b/js/src/jit/JitOptions.cpp
@@ -99,7 +99,7 @@ DefaultJitOptions::DefaultJitOptions()
     SET_DEFAULT(disableLoopUnrolling, true);
 
     // Toggle whether Profile Guided Optimization is globally disabled.
-    SET_DEFAULT(disablePgo, true);
+    SET_DEFAULT(disablePgo, false);
 
     // Toggles whether instruction reordering is globally disabled.
     SET_DEFAULT(disableInstructionReordering, false);
diff --git a/js/src/shell/js.cpp b/js/src/shell/js.cpp
index bce8129bc88..6305c5876d6 100644
--- a/js/src/shell/js.cpp
+++ b/js/src/shell/js.cpp
@@ -6645,7 +6645,7 @@ main(int argc, char** argv, char** envp)
         || !op.addStringOption('\0', "ion-edgecase-analysis", "on/off",
                                "Find edge cases where Ion can avoid bailouts (default: on, off to disable)")
         || !op.addStringOption('\0', "ion-pgo", "on/off",
-                               "Profile guided optimization (default: off, on to enable)")
+                               "Profile guided optimization (default: on, off to disable)")
         || !op.addStringOption('\0', "ion-range-analysis", "on/off",
                                "Range analysis (default: on, off to disable)")
 #if defined(__APPLE__)