diff --git a/build_tc.sh b/build_tc.sh
index 147111b..5b774b3 100644
--- a/build_tc.sh
+++ b/build_tc.sh
@@ -39,7 +39,7 @@ if [ "$STEP" == "opus" ]; then
   cp x64/$MSBUILD_CONFIG/opus.lib $BUILD/lib/opus.lib
   cp -r $SRC/opus/include $BUILD/include/opus
   cp $SRC/opus/opus.pc.in $BUILD/lib/pkgconfig/opus.pc
-  sed -i "s/@prefix@/$BUILD/g" $BUILD/lib/pkgconfig/opus.pc
+  sed -i "s#@prefix@#$BUILD#g" $BUILD/lib/pkgconfig/opus.pc
   sed -i "s/@exec_prefix@/\$\{prefix\}/g" $BUILD/lib/pkgconfig/opus.pc
   sed -i "s/@libdir@/\$\{prefix\}\/lib/g" $BUILD/lib/pkgconfig/opus.pc
   sed -i "s/@includedir@/\$\{prefix\}\/include/g" $BUILD/lib/pkgconfig/opus.pc