diff --git a/CMake/cotire.cmake b/CMake/cotire.cmake
index c17783b..a7d8a64 100644
--- a/CMake/cotire.cmake
+++ b/CMake/cotire.cmake
@@ -45,7 +45,7 @@ if (NOT CMAKE_SCRIPT_MODE_FILE)
 endif()
 
 set (COTIRE_CMAKE_MODULE_FILE "${CMAKE_CURRENT_LIST_FILE}")
-set (COTIRE_CMAKE_MODULE_VERSION "1.5.0")
+set (COTIRE_CMAKE_MODULE_VERSION "1.5.1")
 
 include(CMakeParseArguments)
 include(ProcessorCount)
@@ -564,7 +564,7 @@ function (cotire_get_source_extra_properties _sourceFile _pattern _resultVar)
 			math (EXPR _len "${_len} - 1")
 			foreach (_index RANGE ${_index} ${_len})
 				list (GET _extraProperties ${_index} _value)
-				if ("${_value}" MATCHES "${_pattern}")
+				if (_value MATCHES "${_pattern}")
 					list (APPEND _result "${_value}")
 				else()
 					break()
@@ -793,7 +793,7 @@ macro (cotire_parse_line _line _headerFileVar _headerDepthVar)
 		# English: "Note: including file:   C:\directory\file"
 		# German: "Hinweis: Einlesen der Datei:   C:\directory\file"
 		# We use a very general regular expression, relying on the presence of the : characters
-		if ("${_line}" MATCHES ":( +)([^:]+:[^:]+)$")
+		if (_line MATCHES ":( +)([^:]+:[^:]+)$")
 			# Visual Studio compiler output
 			string (LENGTH "${CMAKE_MATCH_1}" ${_headerDepthVar})
 			get_filename_component(${_headerFileVar} "${CMAKE_MATCH_2}" ABSOLUTE)
@@ -802,7 +802,7 @@ macro (cotire_parse_line _line _headerFileVar _headerDepthVar)
 			set (${_headerDepthVar} 0)
 		endif()
 	else()
-		if ("${_line}" MATCHES "^(\\.+) (.*)$")
+		if (_line MATCHES "^(\\.+) (.*)$")
 			# GCC like output
 			string (LENGTH "${CMAKE_MATCH_1}" ${_headerDepthVar})
 			if (IS_ABSOLUTE "${CMAKE_MATCH_2}")
@@ -1077,7 +1077,7 @@ function (cotire_generate_unity_source _unityFile)
 			list (APPEND _compileUndefinitions ${_option_POST_UNDEFS})
 		endif()
 		foreach (_definition ${_compileDefinitions})
-			if ("${_definition}" MATCHES "^([a-zA-Z0-9_]+)=(.+)$")
+			if (_definition MATCHES "^([a-zA-Z0-9_]+)=(.+)$")
 				list (APPEND _contents "#define ${CMAKE_MATCH_1} ${CMAKE_MATCH_2}")
 				list (INSERT _compileUndefinitions 0 "${CMAKE_MATCH_1}")
 			else()
diff --git a/HISTORY.md b/HISTORY.md
index 7762958..19a87c8 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,7 @@
+## 1.5.1 (2013-11-12)
+
+* fixed string quoting bugs.
+
 ## 1.5.0 (2013-10-13)
 
 * CMake 2.8.12 compatibility fixes.