diff --git a/configure b/configure
index e421c2f7e..9a74c1e49 100755
--- a/configure
+++ b/configure
@@ -16022,7 +16022,7 @@ _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
 
 have_idirafter="yes"
-idirafter="-idirafter"
+idirafter="-idirafter "
 
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
@@ -16030,7 +16030,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 $as_echo "$have_idirafter" >&6; }
 CFLAGS="$save_CFLAGS"
 
-INCLUDE="-I$srcdir/include $idirafter $srcdir/src/video/khronos"
+INCLUDE="-I$srcdir/include $idirafter$srcdir/src/video/khronos"
 if test x$srcdir != x.; then
     INCLUDE="-Iinclude $INCLUDE"
 elif test -d .hg; then
diff --git a/configure.ac b/configure.ac
index 2c312fae5..1e1cec32d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -79,13 +79,13 @@ AC_TRY_COMPILE([
 ],[
 ],[
 have_idirafter="yes"
-idirafter="-idirafter"
+idirafter="-idirafter "
 ])
 AC_MSG_RESULT($have_idirafter)
 CFLAGS="$save_CFLAGS"
 
 dnl Set up the compiler and linker flags
-INCLUDE="-I$srcdir/include $idirafter $srcdir/src/video/khronos"
+INCLUDE="-I$srcdir/include $idirafter$srcdir/src/video/khronos"
 if test x$srcdir != x.; then
     INCLUDE="-Iinclude $INCLUDE"
 elif test -d .hg; then