diff --git a/cMake/FindPySideTools.cmake b/cMake/FindPySideTools.cmake
index c6e64540de..ca1d4fe053 100644
--- a/cMake/FindPySideTools.cmake
+++ b/cMake/FindPySideTools.cmake
@@ -41,9 +41,9 @@ MACRO(PYSIDE_WRAP_UI outfiles)
         # pyside-uic generates in comments at beginning, which is why
         # we follow the tool command with in-place sed.
         ADD_CUSTOM_COMMAND(OUTPUT ${outfile}
-          COMMAND ${PYSIDEUIC4BINARY} "${infile}" -o "${outfile}"
+          COMMAND "${PYSIDEUIC4BINARY}" "${infile}" -o "${outfile}"
           COMMAND sed -i "/^# /d" "${outfile}"
-          MAIN_DEPENDENCY ${infile}
+          MAIN_DEPENDENCY "${infile}"
         )
     endif(WIN32)
     list(APPEND ${outfiles} ${outfile})
@@ -72,10 +72,10 @@ MACRO(PYSIDE_WRAP_RC outfiles)
         # Especially on Open Build Service we don't want changing date like
         # pyside-rcc generates in comments at beginning, which is why
         # we follow the tool command with in-place sed.
-        ADD_CUSTOM_COMMAND(OUTPUT ${outfile}
-          COMMAND ${PYSIDERCC4BINARY} "${infile}" ${PY_ATTRIBUTE} -o "${outfile}"
+        ADD_CUSTOM_COMMAND(OUTPUT "${outfile}"
+          COMMAND "${PYSIDERCC4BINARY}" "${infile}" ${PY_ATTRIBUTE} -o "${outfile}"
           COMMAND sed -i "/^# /d" "${outfile}"
-          MAIN_DEPENDENCY ${infile}
+          MAIN_DEPENDENCY "${infile}"
         )
     endif(WIN32)
     list(APPEND ${outfiles} ${outfile})