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--- a/src/mk/localdefs.in
+++ b/src/mk/localdefs.in
@@ -4,6 +4,8 @@
 
 LIBICONV=@LIBICONV@
 INCICONV=@INCICONV@
+RECOLL_PREFIX=@prefix@
 
-LOCALCXXFLAGS = $(INCICONV) $(XAPIANCXXFLAGS) -DRECOLL_PREFIX=\"@prefix@\"
+LOCALCXXFLAGS = $(INCICONV) $(XAPIANCXXFLAGS) \
+	      -DRECOLL_PREFIX=\"$(RECOLL_PREFIX)\"