diff --git a/src/libslic3r/Config.cpp b/src/libslic3r/Config.cpp
index f5902f403..18b97665d 100644
--- a/src/libslic3r/Config.cpp
+++ b/src/libslic3r/Config.cpp
@@ -73,7 +73,7 @@ std::string escape_strings_cstyle(const std::vector<std::string> &strs)
         bool should_quote = strs.size() == 1 && str.empty();
         for (size_t i = 0; i < str.size(); ++ i) {
             char c = str[i];
-            if (c == ' ' || c == '\t' || c == '\\' || c == '"' || c == '\r' || c == '\n') {
+            if (c == ' ' || c == ';' || c == '\t' || c == '\\' || c == '"' || c == '\r' || c == '\n') {
                 should_quote = true;
                 break;
             }