diff --git a/fuzz/qpdf_fuzzer.cc b/fuzz/qpdf_fuzzer.cc
index 3486c1be..2f6909fe 100644
--- a/fuzz/qpdf_fuzzer.cc
+++ b/fuzz/qpdf_fuzzer.cc
@@ -181,8 +181,8 @@ FuzzHelper::doChecks()
     // occur legitimately and therefore must be allowed during normal operations.
     Pl_DCT::setMemoryLimit(1'000'000'000);
 
-    Pl_PNGFilter::setMemoryLimit(1'000'000'000);
-    Pl_TIFFPredictor::setMemoryLimit(1'000'000'000);
+    Pl_PNGFilter::setMemoryLimit(1'000'000);
+    Pl_TIFFPredictor::setMemoryLimit(1'000'000);
 
     // Do not decompress corrupt data. This may cause extended runtime within jpeglib without
     // exercising additional code paths in qpdf, and potentially causing counterproductive timeouts.