diff --git a/java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt b/java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt
index 0b975d9b829..4ff255a0fd1 100644
--- a/java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt
+++ b/java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt
@@ -4391,6 +4391,55 @@ open class KotlinFileExtractor(
                     tw.writeExprsKotlinType(id, type.kotlinResult.id)
                     unaryopDisp(id)
                 }
+                // Fold unaryMinus applied to a numeric constant into a single negative literal.
+                // In K2 mode, `-123L` is emitted as IrCall(unaryMinus, IrConst(123L)) rather than
+                // IrConst(-123L) as in K1. Folding restores K1 behaviour and makes negative
+                // numeric literals directly queryable in both modes.
+                isNumericFunction(target, "unaryMinus") && c.dispatchReceiver is CodeQLIrConst<*> -> {
+                    val receiver = c.dispatchReceiver as CodeQLIrConst<*>
+                    val v = receiver.value
+                    val type = useType(c.type)
+                    // In K2 the IrCall's startOffset equals the receiver's startOffset, so the
+                    // minus sign (one character before the literal) must be recovered from the source.
+                    val locId =
+                        if (receiver.startOffset > 0)
+                            tw.getLocation(receiver.startOffset - 1, c.endOffset)
+                        else
+                            tw.getLocation(c)
+                    when (v) {
+                        is Int ->
+                            extractConstantInteger(-v, locId, parent, idx, callable, enclosingStmt)
+                        is Short ->
+                            extractConstantInteger(-v.toInt(), locId, parent, idx, callable, enclosingStmt)
+                        is Byte ->
+                            extractConstantInteger(-v.toInt(), locId, parent, idx, callable, enclosingStmt)
+                        is Long ->
+                            exprIdOrFresh<DbLongliteral>(null).also { id ->
+                                tw.writeExprs_longliteral(id, type.javaResult.id, parent, idx)
+                                tw.writeExprsKotlinType(id, type.kotlinResult.id)
+                                extractExprContext(id, locId, callable, enclosingStmt)
+                                tw.writeNamestrings((-v).toString(), (-v).toString(), id)
+                            }
+                        is Float ->
+                            exprIdOrFresh<DbFloatingpointliteral>(null).also { id ->
+                                tw.writeExprs_floatingpointliteral(id, type.javaResult.id, parent, idx)
+                                tw.writeExprsKotlinType(id, type.kotlinResult.id)
+                                extractExprContext(id, locId, callable, enclosingStmt)
+                                tw.writeNamestrings((-v).toString(), (-v).toString(), id)
+                            }
+                        is Double ->
+                            exprIdOrFresh<DbDoubleliteral>(null).also { id ->
+                                tw.writeExprs_doubleliteral(id, type.javaResult.id, parent, idx)
+                                tw.writeExprsKotlinType(id, type.kotlinResult.id)
+                                extractExprContext(id, locId, callable, enclosingStmt)
+                                tw.writeNamestrings((-v).toString(), (-v).toString(), id)
+                            }
+                        else ->
+                            logger.errorElement(
+                                "Unexpected constant type for unaryMinus folding: ${v?.javaClass}", c
+                            )
+                    }
+                }
                 isNumericFunction(target, "inv", "unaryMinus", "unaryPlus") -> {
                     val type = useType(c.type)
                     val id: Label<out DbExpr> =
diff --git a/java/ql/test-kotlin2/library-tests/literals/literals.expected b/java/ql/test-kotlin2/library-tests/literals/literals.expected
index bb6f6fd4739..3cea3c83ac5 100644
--- a/java/ql/test-kotlin2/library-tests/literals/literals.expected
+++ b/java/ql/test-kotlin2/library-tests/literals/literals.expected
@@ -11,16 +11,16 @@
 | literals.kt:13:30:13:33 | -123 | LongLiteral |
 | literals.kt:14:30:14:31 | 0 | LongLiteral |
 | literals.kt:15:30:15:33 | 123 | LongLiteral |
-| literals.kt:16:31:16:34 | 123 | LongLiteral |
+| literals.kt:16:30:16:34 | -123 | LongLiteral |
 | literals.kt:17:30:17:33 | 15 | LongLiteral |
 | literals.kt:18:30:18:39 | 11 | LongLiteral |
 | literals.kt:19:30:19:38 | 1234567 | LongLiteral |
 | literals.kt:20:32:20:35 | 0.0 | FloatLiteral |
 | literals.kt:21:32:21:37 | 123.4 | FloatLiteral |
-| literals.kt:22:33:22:38 | 123.4 | FloatLiteral |
+| literals.kt:22:32:22:38 | -123.4 | FloatLiteral |
 | literals.kt:23:34:23:36 | 0.0 | DoubleLiteral |
 | literals.kt:24:34:24:38 | 123.4 | DoubleLiteral |
-| literals.kt:25:35:25:39 | 123.4 | DoubleLiteral |
+| literals.kt:25:34:25:39 | -123.4 | DoubleLiteral |
 | literals.kt:26:30:26:32 | c | CharacterLiteral |
 | literals.kt:27:30:27:33 | \n | CharacterLiteral |
 | literals.kt:28:34:28:35 | "" | StringLiteral |