diff --git a/core/config.mk b/core/config.mk
index 8863064..ba2e7d5 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -550,6 +550,8 @@
 MD5SUM:=md5sum
 endif
 
+NORMALIZE_PATH := build/tools/normalize_path.py
+
 APICHECK_CLASSPATH := $(HOST_JDK_TOOLS_JAR)
 APICHECK_CLASSPATH := $(APICHECK_CLASSPATH):$(HOST_OUT_JAVA_LIBRARIES)/doclava$(COMMON_JAVA_PACKAGE_SUFFIX)
 APICHECK_CLASSPATH := $(APICHECK_CLASSPATH):$(HOST_OUT_JAVA_LIBRARIES)/jsilver$(COMMON_JAVA_PACKAGE_SUFFIX)
diff --git a/core/definitions.mk b/core/definitions.mk
index a036a25..ecc7253 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1804,7 +1804,7 @@
           find $(PRIVATE_SOURCE_INTERMEDIATES_DIR) -name '*.java' -and -not -name '.*' >> $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list; \
 fi
 $(hide) tr ' ' '\n' < $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list \
-    | sort -u > $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list-uniq
+    | $(NORMALIZE_PATH) | sort -u > $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list-uniq
 $(hide) if [ -s $(PRIVATE_CLASS_INTERMEDIATES_DIR)/java-source-list-uniq ] ; then \
     $(1) -encoding UTF-8 \
     $(if $(findstring true,$(PRIVATE_WARNINGS_ENABLE)),$(xlint_unchecked),) \
@@ -1867,7 +1867,7 @@
           find $(PRIVATE_SOURCE_INTERMEDIATES_DIR) -name '*.java' >> $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list; \
 fi
 $(hide) tr ' ' '\n' < $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list \
-    | sort -u > $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list-uniq
+    | $(NORMALIZE_PATH) | sort -u > $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list-uniq
 $(if $(PRIVATE_JACK_PROGUARD_FLAGS), \
     $(hide) echo -basedirectory $(CURDIR) > $@.flags; \
     echo $(PRIVATE_JACK_PROGUARD_FLAGS) >> $@.flags; \
@@ -1946,7 +1946,7 @@
           find $(PRIVATE_SOURCE_INTERMEDIATES_DIR) -name '*.java' >> $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list; \
 fi
 $(hide) tr ' ' '\n' < $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list \
-    | sort -u > $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list-uniq
+    | $(NORMALIZE_PATH) | sort -u > $(PRIVATE_JACK_INTERMEDIATES_DIR)/java-source-list-uniq
 $(if $(PRIVATE_JACK_PROGUARD_FLAGS), \
     $(hide) echo -basedirectory $(CURDIR) > $@.flags; \
     echo $(PRIVATE_JACK_PROGUARD_FLAGS) >> $@.flags; \
diff --git a/tools/normalize_path.py b/tools/normalize_path.py
new file mode 100755
index 0000000..1b3d42e
--- /dev/null
+++ b/tools/normalize_path.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2015 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+Normalize and output paths read from stdin.
+"""
+
+import os.path
+import sys
+
+for line in sys.stdin:
+  print os.path.normpath(line.strip())