diff --git a/CHANGES b/CHANGES
index c47654f94a..3d124b1c5a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,9 @@
 
+2.5-352 | 2017-11-21 13:21:51 -0600
+
+  * Fix assignments to event arguments becoming visible to subsequent
+    handlers. (Robin Sommer)
+
 2.5-350 | 2017-11-21 12:19:28 -0600
 
   * Add HookReporter plugin hook function.
diff --git a/VERSION b/VERSION
index 6fb178837c..0ddfa81ebe 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.5-350
+2.5-352
diff --git a/src/Func.cc b/src/Func.cc
index 88da9a7a04..f7877d04a0 100644
--- a/src/Func.cc
+++ b/src/Func.cc
@@ -383,11 +383,7 @@ Val* BroFunc::Call(val_list* args, Frame* parent) const
 			FType()->FlavorString().c_str(), d.Description());
 		}
 
-	loop_over_list(*args, i)
-		f->SetElement(i, (*args)[i]);
-
 	stmt_flow_type flow = FLOW_NEXT;
-
 	Val* result = 0;
 
 	for ( size_t i = 0; i < bodies.size(); ++i )
@@ -397,6 +393,20 @@ Val* BroFunc::Call(val_list* args, Frame* parent) const
 				bodies[i].stmts->GetLocationInfo());
 
 		Unref(result);
+
+		loop_over_list(*args, j)
+			{
+			Val* arg = (*args)[j];
+
+			if ( f->NthElement(j) != arg )
+				{
+				// Either not yet set, or somebody reassigned
+				// the frame slot.
+				Ref(arg);
+				f->SetElement(j, arg);
+				}
+			}
+
 		f->Reset(args->length());
 
 		try
@@ -434,6 +444,11 @@ Val* BroFunc::Call(val_list* args, Frame* parent) const
 			}
 		}
 
+	// We have an extra Ref for each argument (so that they don't get
+	// deleted between bodies), release that.
+	loop_over_list(*args, k)
+		Unref((*args)[k]);
+
 	if ( Flavor() == FUNC_FLAVOR_HOOK )
 		{
 		if ( ! result )
diff --git a/testing/btest/Baseline/core.event-arg-reuse/output b/testing/btest/Baseline/core.event-arg-reuse/output
new file mode 100644
index 0000000000..52024ab5f2
--- /dev/null
+++ b/testing/btest/Baseline/core.event-arg-reuse/output
@@ -0,0 +1,2 @@
+f1, 2
+f2, 1
diff --git a/testing/btest/Baseline/signatures.load-sigs/output b/testing/btest/Baseline/signatures.load-sigs/output
index 52e0eeb92c..d58d0c0a39 100644
--- a/testing/btest/Baseline/signatures.load-sigs/output
+++ b/testing/btest/Baseline/signatures.load-sigs/output
@@ -1,3 +1,3 @@
 [orig_h=141.142.220.118, orig_p=35642/tcp, resp_h=208.80.152.2, resp_p=80/tcp]
 works
-GET /images/wikimedia-button.png HTTP/1.1\x0d\x0aHost: meta.wikimedia.org\x0d\x0aUser-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Geck...
+GET /images/wikimedia-button.png HTTP/1.1\x0d\x0aHost: meta.wikimedia.org\x0d\x0aUser-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110303 Ubuntu/10.04 (lucid) Firefox/3.6.15\x0d\x0aAccept: image/png,image/*;q=0.8,*/*;q=0.5\x0d\x0aAccept-Language: en-us,en;q=0.5\x0d\x0aAccept-Encoding: gzip,deflate\x0d\x0aAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\x0d\x0aKeep-Alive: 115\x0d\x0aConnection: keep-alive\x0d\x0aReferer: http://www.wikipedia.org/\x0d\x0aIf-Modified-Since: Fri, 05 Nov 2010 16:00:03 GMT\x0d\x0aIf-None-Match: "97a-494505e0c46c0"\x0d\x0aCache-Control: max-age=0\x0d\x0a\x0d\x0a
diff --git a/testing/btest/core/event-arg-reuse.bro b/testing/btest/core/event-arg-reuse.bro
new file mode 100644
index 0000000000..ba8e0f0677
--- /dev/null
+++ b/testing/btest/core/event-arg-reuse.bro
@@ -0,0 +1,20 @@
+# @TEST-DOC: Check that assignment to event parameters isn't visible to other handlers.
+#
+# @TEST-EXEC: bro -b %INPUT >output
+# @TEST-EXEC: btest-diff output
+
+event f(a: int) &priority=5
+	{
+	a = 2;
+	print "f1", a;
+	}
+
+event f(a: int) &priority=-5
+	{
+	print "f2", a;
+	}
+
+event bro_init()
+	{
+	event f(1);
+	}