diff --git a/src/Makefile.am b/src/Makefile.am
index 07a4ee7..35b91c1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,6 +1,7 @@
 
 bin_PROGRAMS = zzuf
 zzuf_SOURCES = zzuf.c
+zzuf_CPPFLAGS = -DLIBDIR=\"$(libdir)/zzuf\"
 
 pkglib_LTLIBRARIES = libzzuf.la
 libzzuf_la_SOURCES = libzzuf.c libzzuf.h fuzz.c fuzz.h debug.c debug.h preload.c preload.h random.c random.h
diff --git a/src/zzuf.c b/src/zzuf.c
index a398482..c5e5f13 100644
--- a/src/zzuf.c
+++ b/src/zzuf.c
@@ -144,8 +144,7 @@ static void set_ld_preload(char const *progpath)
     }
     free(libpath);
 
-    /* FIXME: use real path */
-    setenv("LD_PRELOAD", "/usr/lib/zzuf/libzzuf.so", 1);
+    setenv("LD_PRELOAD", LIBDIR "/libzzuf.so", 1);
 }
 
 static void version(void)