diff --git a/common.cpp b/common.cpp
index 797398e8e..7a9f7a514 100644
--- a/common.cpp
+++ b/common.cpp
@@ -1739,7 +1739,6 @@ bool string_prefixes_string(const wchar_t *proposed_prefix, const wcstring &valu
     return prefix_size <= value.size() && value.compare(0, prefix_size, proposed_prefix) == 0;
 }
 
-
 bool string_prefixes_string(const wcstring &proposed_prefix, const wcstring &value)
 {
     size_t prefix_size = proposed_prefix.size();
diff --git a/screen.cpp b/screen.cpp
index 68f78ad7f..9cae7d360 100644
--- a/screen.cpp
+++ b/screen.cpp
@@ -289,7 +289,7 @@ static prompt_layout_t calc_prompt_layout(const wchar_t *prompt)
                 if (prompt[j+1] == L'k')
                 {
                     const env_var_t term_name = env_get_string(L"TERM");
-                    if (!term_name.missing() && wcsstr(term_name.c_str(), L"screen") == term_name)
+                    if (!term_name.missing() && string_prefixes_string(L"screen", term_name))
                     {
                         const wchar_t *end;
                         j+=2;