diff --git a/configure b/configure
index 64be2bf24a..f96149aa08 100755
--- a/configure
+++ b/configure
@@ -327,10 +327,10 @@ TMPH="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.h"
 logging="yes"
 logfile="config.err"
 prefix="/usr/local"
-libdir="${prefix}/lib"
-incdir="${prefix}/include/ffmpeg"
-mandir="${prefix}/man"
-bindir="${prefix}/bin"
+libdir='${prefix}/lib'
+incdir='${prefix}/include/ffmpeg'
+mandir='${prefix}/man'
+bindir='${prefix}/bin'
 cross_prefix=""
 cross_compile="no"
 cc="gcc"