diff --git a/configure b/configure
index 3096c9982..709288cb1 100755
--- a/configure
+++ b/configure
@@ -19958,6 +19958,7 @@ else
 	  else
 	    if test -f /usr/local/include/google/protobuf-c/protobuf-c.h; then
 	      CFLAGS="$CFLAGS -I/usr/local/include/google"
+	      LDFLAGS="$LDFLAGS -L/usr/local/lib"
 	    fi
 	  fi
 
diff --git a/dnstap/dnstap.m4 b/dnstap/dnstap.m4
index ea044e97a..9ca6d2790 100644
--- a/dnstap/dnstap.m4
+++ b/dnstap/dnstap.m4
@@ -36,6 +36,7 @@ AC_DEFUN([dt_DNSTAP],
 	  else
 	    if test -f /usr/local/include/google/protobuf-c/protobuf-c.h; then
 	      CFLAGS="$CFLAGS -I/usr/local/include/google"
+	      LDFLAGS="$LDFLAGS -L/usr/local/lib"
 	    fi
 	  fi
     ])