diff --git a/implementations/main.cpp b/implementations/main.cpp
index 607e764..189967f 100644
--- a/implementations/main.cpp
+++ b/implementations/main.cpp
@@ -81,6 +81,15 @@ std::string g_logDir = "/var/log/fingerprintd";
 std::string g_stateDir = "/var/lib/fingerprintd";
 int g_rescan = -1;          // -1 = leave the config's value alone
 
+// What a press that ends with no terminal verdict means. At the stock rescan
+// budget a wrong finger answers "not identified yet" on every frame and never
+// yields a terminal frame, so its press is undecided at lift -- and the only
+// way a client ever hears verify-no-match is to treat that as one. The cost is
+// on the correct finger: a press that ran out of frames before the matcher
+// reached a verdict is also reported as no-match. Under rescan=0 this cannot
+// arise (every frame is terminal), so the knob only matters with a budget.
+bool g_undecidedIsNoMatch = false;
+
 // The namespace key the trustlet hashes into the SFS group's directory name.
 // It defaults to Android's because that is what this device's existing store
 // was written under. It does NOT isolate anything -- SET_ACTIVE_GROUP's path
@@ -1297,12 +1306,13 @@ public:
                     inPress = false;
                     if (pressMatched) {
                         out.decided = true; out.matched = true; out.fid = pressFid;
-                    } else if (pressRejected) {
+                    } else if (pressRejected || (g_undecidedIsNoMatch && pressFrames > 0)) {
                         out.decided = true; out.matched = false;
                     }
                     std::println("  press {}: {} frames, {} rescans -> {}", out.presses, pressFrames,
                                  rescans, pressMatched ? std::format("MATCH fid={}", pressFid)
-                                        : pressRejected ? "NO MATCH" : "undecided");
+                                        : pressRejected ? "NO MATCH"
+                                        : out.decided ? "NO MATCH (undecided at lift)" : "undecided");
                 }
             }
             if (finger) pressFrames++;
@@ -2060,6 +2070,7 @@ int main(int argc, char** argv) {
         if (a == "--cal-save") { doCalSave = true; probe = true; g_verbose = true; }
         if (a.starts_with("--frames=")) frames = std::stoi(std::string(a.substr(9)));
         if (a.starts_with("--frame-gap=")) g_frameGapMs = std::stoi(std::string(a.substr(12)));
+        if (a == "--undecided=nomatch") g_undecidedIsNoMatch = true;
         if (a.starts_with("--log-dir=")) g_logDir = a.substr(10);
         if (a.starts_with("--state-dir=")) g_stateDir = a.substr(12);
         if (a.starts_with("--rescan=")) g_rescan = std::stoi(std::string(a.substr(9)));