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diff --git a/src/3rdparty/double-conversion/strtod.cc b/src/3rdparty/double-conversion/strtod.cc
index e8cc13f2de..1b9f0f5b74 100644
--- a/src/3rdparty/double-conversion/strtod.cc
+++ b/src/3rdparty/double-conversion/strtod.cc
@@ -198,6 +198,12 @@ static bool DoubleStrtod(Vector<const char> trimmed,
int exponent,
double* result) {
#if !defined(DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS)
+ // NB: Qt uses -Werror=unused-parameter which results in compiler error here
+ // in this branch. Using "(void)x" idiom to prevent the error.
+ (void)trimmed;
+ (void)exponent;
+ (void)result;
+
// On x86 the floating-point stack can be 64 or 80 bits wide. If it is
// 80 bits wide (as is the case on Linux) then double-rounding occurs and the
// result is not accurate.
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