diff --git a/Modules/Core/Common/src/itkNumberToString.cxx b/Modules/Core/Common/src/itkNumberToString.cxx
index 70602338562..abe861df524 100644
--- a/Modules/Core/Common/src/itkNumberToString.cxx
+++ b/Modules/Core/Common/src/itkNumberToString.cxx
@@ -17,7 +17,7 @@
  *=========================================================================*/
 #include "itkNumberToString.h"
 #include "itkNumericTraits.h"
-#include "double-conversion.h"
+#include "double-conversion/double-conversion.h"
 
 #include <sstream>
 
diff --git a/Modules/ThirdParty/DoubleConversion/CMakeLists.txt b/Modules/ThirdParty/DoubleConversion/CMakeLists.txt
index 7075d94c6ff..357b7c26ab0 100644
--- a/Modules/ThirdParty/DoubleConversion/CMakeLists.txt
+++ b/Modules/ThirdParty/DoubleConversion/CMakeLists.txt
@@ -14,7 +14,7 @@ if(ITK_USE_SYSTEM_DOUBLECONVERSION)
 
   if (double-conversion_LIBRARIES AND double-conversion_INCLUDE_DIRS)
     set(ITKDoubleConversion_SYSTEM_INCLUDE_DIRS
-      ${double-conversion_INCLUDE_DIRS})
+      ${double-conversion_INCLUDE_DIRS}/..)
     set(ITKDoubleConversion_LIBRARIES
       "${double-conversion_LIBRARIES}")
   else()
@@ -22,7 +22,7 @@ if(ITK_USE_SYSTEM_DOUBLECONVERSION)
   endif()
 else()
   set(ITKDoubleConversion_INCLUDE_DIRS
-    ${ITKDoubleConversion_SOURCE_DIR}/src/double-conversion
+    ${ITKDoubleConversion_SOURCE_DIR}/src
     ${ITKDoubleConversion_BINARY_DIR}/src/double-conversion)
   set(ITKDoubleConversion_LIBRARIES itkdouble-conversion)
 endif()