diff --git a/simspark.spec b/simspark.spec
index 025d6dc..421f3ef 100644
--- a/simspark.spec
+++ b/simspark.spec
@@ -36,8 +36,8 @@ developing applications that use %{name}.
 %setup -q
 %patch0 -p1 -b .mlibfix
 # Applied upstream
-find -name "*.cpp" -o -name "*.h" -exec sed -i.boostfix "s|shared_dynamic_cast|dynamic_pointer_cast|g" {} \;
-find -name "*.cpp" -o -name "*.h" -exec sed -i.boostfix "s|shared_static_cast|static_pointer_cast|g" {} \;
+find "(" -name "*.cpp" -o -name "*.h" ")" -exec sed -i.boostfix "s|shared_dynamic_cast|dynamic_pointer_cast|g" {} \;
+find "(" -name "*.cpp" -o -name "*.h" ")" -exec sed -i.boostfix "s|shared_static_cast|static_pointer_cast|g" {} \;
 
 %build
 mkdir build