diff --git a/doc/09-object-types.md b/doc/09-object-types.md
index ebbf2e546..4a2b474e0 100644
--- a/doc/09-object-types.md
+++ b/doc/09-object-types.md
@@ -200,7 +200,7 @@ Configuration Attributes:
   parent\_service\_name     | Object name           | **Optional.** The parent service. If omitted, this dependency object is treated as host dependency.
   child\_host\_name         | Object name           | **Required.** The child host.
   child\_service\_name      | Object name           | **Optional.** The child service. If omitted, this dependency object is treated as host dependency.
-  disable\_checks           | Boolean               | **Optional.** Whether to disable checks when this dependency fails. Defaults to false.
+  disable\_checks           | Boolean               | **Optional.** Whether to disable checks (i.e., don't schedule active checks and drop passive results) when this dependency fails. Defaults to false.
   disable\_notifications    | Boolean               | **Optional.** Whether to disable notifications when this dependency fails. Defaults to true.
   ignore\_soft\_states      | Boolean               | **Optional.** Whether to ignore soft states for the reachability calculation. Defaults to true.
   period                    | Object name           | **Optional.** Time period object during which this dependency is enabled.
diff --git a/lib/icinga/apiactions.cpp b/lib/icinga/apiactions.cpp
index 8a7e8a9a8..f9d585a06 100644
--- a/lib/icinga/apiactions.cpp
+++ b/lib/icinga/apiactions.cpp
@@ -1,6 +1,7 @@
 /* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
 
 #include "icinga/apiactions.hpp"
+#include "icinga/checkable.hpp"
 #include "icinga/service.hpp"
 #include "icinga/servicegroup.hpp"
 #include "icinga/hostgroup.hpp"
@@ -58,6 +59,9 @@ Dictionary::Ptr ApiActions::ProcessCheckResult(const ConfigObject::Ptr& object,
 	if (!checkable->GetEnablePassiveChecks())
 		return ApiActions::CreateResult(403, "Passive checks are disabled for object '" + checkable->GetName() + "'.");
 
+	if (!checkable->IsReachable(DependencyCheckExecution))
+		return ApiActions::CreateResult(200, "Ignoring passive check result for unreachable object '" + checkable->GetName() + "'.");
+
 	Host::Ptr host;
 	Service::Ptr service;
 	tie(host, service) = GetHostService(checkable);
diff --git a/lib/icinga/externalcommandprocessor.cpp b/lib/icinga/externalcommandprocessor.cpp
index e974a0175..c51a9bf1f 100644
--- a/lib/icinga/externalcommandprocessor.cpp
+++ b/lib/icinga/externalcommandprocessor.cpp
@@ -1,6 +1,7 @@
 /* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
 
 #include "icinga/externalcommandprocessor.hpp"
+#include "icinga/checkable.hpp"
 #include "icinga/host.hpp"
 #include "icinga/service.hpp"
 #include "icinga/user.hpp"
@@ -283,6 +284,12 @@ void ExternalCommandProcessor::ProcessHostCheckResult(double time, const std::ve
 	if (!host->GetEnablePassiveChecks())
 		BOOST_THROW_EXCEPTION(std::invalid_argument("Got passive check result for host '" + arguments[0] + "' which has passive checks disabled."));
 
+	if (!host->IsReachable(DependencyCheckExecution)) {
+		Log(LogNotice, "ExternalCommandProcessor")
+			<< "Ignoring passive check result for unreachable host '" << arguments[0] << "'";
+		return;
+	}
+
 	int exitStatus = Convert::ToDouble(arguments[1]);
 	CheckResult::Ptr result = new CheckResult();
 	std::pair<String, String> co = PluginUtility::ParseCheckOutput(arguments[2]);
@@ -324,6 +331,12 @@ void ExternalCommandProcessor::ProcessServiceCheckResult(double time, const std:
 	if (!service->GetEnablePassiveChecks())
 		BOOST_THROW_EXCEPTION(std::invalid_argument("Got passive check result for service '" + arguments[1] + "' which has passive checks disabled."));
 
+	if (!service->IsReachable(DependencyCheckExecution)) {
+		Log(LogNotice, "ExternalCommandProcessor")
+			<< "Ignoring passive check result for unreachable service '" << arguments[1] << "'";
+		return;
+	}
+
 	int exitStatus = Convert::ToDouble(arguments[2]);
 	CheckResult::Ptr result = new CheckResult();
 	String output = CompatUtility::UnEscapeString(arguments[3]);