diff --git a/tests/perf/operation/predicate/RectangleIntersectsPerfTest.cpp b/tests/perf/operation/predicate/RectangleIntersectsPerfTest.cpp
index 400f5acffc..c09b6efeee 100644
--- a/tests/perf/operation/predicate/RectangleIntersectsPerfTest.cpp
+++ b/tests/perf/operation/predicate/RectangleIntersectsPerfTest.cpp
@@ -108,7 +108,7 @@ class RectangleIntersectsPerfTest
   }
 
   // Push newly created geoms to rectLit
-  void createRectangles(const Envelope& env, int nRect, double rectSize,
+  void createRectangles(const Envelope& env, int nRect, double,
                         vector<const Geometry*>& rectList)
   {
     int nSide =  1 + (int)sqrt((double) nRect);
diff --git a/tests/unit/capi/GEOSSTRtreeTest.cpp b/tests/unit/capi/GEOSSTRtreeTest.cpp
index 8ecef3608b..a3f6293931 100644
--- a/tests/unit/capi/GEOSSTRtreeTest.cpp
+++ b/tests/unit/capi/GEOSSTRtreeTest.cpp
@@ -23,7 +23,7 @@ static GEOSGeometry* INTPOINT2GEOS(INTPOINT* p) {
 	return GEOSGeom_createPoint(seq);
 }
 
-static int INTPOINT_dist(const void* a, const void* b, double* distance, void* userdata) {
+static int INTPOINT_dist(const void* a, const void* b, double* distance, void*) {
 	INTPOINT* p1 = (INTPOINT*) a;
 	INTPOINT* p2 = (INTPOINT*) b;
 
diff --git a/tests/xmltester/XMLTester.cpp b/tests/xmltester/XMLTester.cpp
index 2307ae1df0..158d2c5fbf 100644
--- a/tests/xmltester/XMLTester.cpp
+++ b/tests/xmltester/XMLTester.cpp
@@ -1560,7 +1560,7 @@ usage(char *me, int exitcode, std::ostream &os)
 }
 
 void
-request_interrupt(int sig)
+request_interrupt(int)
 {
   geos::util::Interrupt::request();
 }