diff --git a/t/30mouse.c b/t/30mouse.c
index d543d22..f806dfb 100644
--- a/t/30mouse.c
+++ b/t/30mouse.c
@@ -10,7 +10,7 @@ int main(int argc, char *argv[])
   char       buffer[32];
   size_t     len;
 
-  plan_tests(20);
+  plan_tests(31);
 
   /* vt100 doesn't have a mouse, we need xterm */
   tk = termkey_new_abstract("xterm", 0);
@@ -27,6 +27,7 @@ int main(int argc, char *argv[])
   is_int(button, 1,                   "mouse button for press");
   is_int(line,   1,                   "mouse line for press");
   is_int(col,    1,                   "mouse column for press");
+  is_int(key.modifiers, 0,            "modifiers for press");
 
   len = termkey_strfkey(tk, buffer, sizeof buffer, &key, 0);
   is_int(len, 13, "string length for press");
@@ -45,6 +46,7 @@ int main(int argc, char *argv[])
   is_int(button, 1,                   "mouse button for drag");
   is_int(line,   1,                   "mouse line for drag");
   is_int(col,    2,                   "mouse column for drag");
+  is_int(key.modifiers, 0,            "modifiers for press");
 
   termkey_push_bytes(tk, "\e[M##!", 6);
 
@@ -54,6 +56,22 @@ int main(int argc, char *argv[])
   is_int(ev,     TERMKEY_MOUSE_RELEASE, "mouse event for release");
   is_int(line,   1,                     "mouse line for release");
   is_int(col,    3,                     "mouse column for release");
+  is_int(key.modifiers, 0,            "modifiers for press");
+
+  termkey_push_bytes(tk, "\e[M0++", 6);
+
+  termkey_getkey(tk, &key);
+  is_int(termkey_interpret_mouse(tk, &key, &ev, &button, &line, &col), TERMKEY_RES_KEY, "interpret_mouse yields RES_KEY");
+
+  is_int(ev,     TERMKEY_MOUSE_PRESS, "mouse event for Ctrl-press");
+  is_int(button, 1,                   "mouse button for Ctrl-press");
+  is_int(line,   11,                  "mouse line for Ctrl-press");
+  is_int(col,    11,                  "mouse column for Ctrl-press");
+  is_int(key.modifiers, TERMKEY_KEYMOD_CTRL, "modifiers for Ctrl-press");
+
+  len = termkey_strfkey(tk, buffer, sizeof buffer, &key, 0);
+  is_int(len, 15, "string length for Ctrl-press");
+  is_str(buffer, "C-MousePress(1)", "string buffer for Ctrl-press");
 
   termkey_destroy(tk);
 
diff --git a/termkey.c b/termkey.c
index 163e168..e3dec33 100644
--- a/termkey.c
+++ b/termkey.c
@@ -894,7 +894,10 @@ static TermKeyResult peekkey_mouse(TermKey *tk, TermKeyKey *key, size_t *nbytep)
   key->code.mouse[0] = CHARAT(0) - 0x20;
   key->code.mouse[1] = CHARAT(1) - 0x20;
   key->code.mouse[2] = CHARAT(2) - 0x20;
-  key->modifiers     = 0;
+
+  key->modifiers     = (key->code.mouse[0] & 0x1c) >> 2;
+  key->code.mouse[0] &= ~0x1c;
+
   *nbytep = 3;
   return TERMKEY_RES_KEY;
 }
@@ -922,12 +925,14 @@ TermKeyResult termkey_interpret_mouse(TermKey *tk, const TermKeyKey *key, TermKe
 
   int drag = code & 0x20;
 
-  switch(code & ~0x20) {
+  code &= ~0x3c;
+
+  switch(code) {
   case 0:
   case 1:
   case 2:
     *event = drag ? TERMKEY_MOUSE_DRAG : TERMKEY_MOUSE_PRESS;
-    btn = (code & ~0x20) + 1;
+    btn = code + 1;
     break;
 
   case 3:
@@ -938,7 +943,7 @@ TermKeyResult termkey_interpret_mouse(TermKey *tk, const TermKeyKey *key, TermKe
   case 64:
   case 65:
     *event = drag ? TERMKEY_MOUSE_DRAG : TERMKEY_MOUSE_PRESS;
-    btn = (code & ~0x20) + 4 - 64;
+    btn = code + 4 - 64;
     break;
 
   default: