diff --git a/fuzz/CMakeLists.txt b/fuzz/CMakeLists.txt
index fbcba889..944920e0 100644
--- a/fuzz/CMakeLists.txt
+++ b/fuzz/CMakeLists.txt
@@ -100,6 +100,7 @@ set(CORPUS_OTHER
   16953.fuzz
   17630.fuzz
   17630a.fuzz
+  17630b.fuzz
   18241.fuzz
   18247.fuzz
   23172.fuzz
diff --git a/fuzz/dct_fuzzer.cc b/fuzz/dct_fuzzer.cc
index 2179a377..25a68ea0 100644
--- a/fuzz/dct_fuzzer.cc
+++ b/fuzz/dct_fuzzer.cc
@@ -30,7 +30,7 @@ FuzzHelper::doChecks()
     // fuzzing is due to corrupt JPEG data which sometimes cannot be detected before
     // jpeg_start_decompress is called. During normal use of qpdf very large JPEGs can occasionally
     // occur legitimately and therefore must be allowed during normal operations.
-    Pl_DCT::setMemoryLimit(1'000'000'000);
+    Pl_DCT::setMemoryLimit(200'000'000);
 
     // Do not decompress corrupt data. This may cause extended runtime within jpeglib without
     // exercising additional code paths in qpdf.
diff --git a/fuzz/qpdf_extra/17630b.fuzz b/fuzz/qpdf_extra/17630b.fuzz
new file mode 100644
index 00000000..78d56cde
Binary files /dev/null and b/fuzz/qpdf_extra/17630b.fuzz differ
diff --git a/fuzz/qpdf_fuzzer.cc b/fuzz/qpdf_fuzzer.cc
index f41933dc..16e175e4 100644
--- a/fuzz/qpdf_fuzzer.cc
+++ b/fuzz/qpdf_fuzzer.cc
@@ -180,11 +180,11 @@ FuzzHelper::doChecks()
     // fuzzing is due to corrupt JPEG data which sometimes cannot be detected before
     // jpeg_start_decompress is called. During normal use of qpdf very large JPEGs can occasionally
     // occur legitimately and therefore must be allowed during normal operations.
-    Pl_DCT::setMemoryLimit(1'000'000'000);
+    Pl_DCT::setMemoryLimit(100'000'000);
 
     Pl_PNGFilter::setMemoryLimit(1'000'000);
     Pl_TIFFPredictor::setMemoryLimit(1'000'000);
-    Pl_Flate::setMemoryLimit(10'000'000);
+    Pl_Flate::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.
diff --git a/fuzz/qtest/fuzz.test b/fuzz/qtest/fuzz.test
index da6f857b..eb9123b6 100644
--- a/fuzz/qtest/fuzz.test
+++ b/fuzz/qtest/fuzz.test
@@ -21,7 +21,7 @@ my @fuzzers = (
     ['pngpredictor' => 1],
     ['runlength' => 6],
     ['tiffpredictor' => 2],
-    ['qpdf' => 73],             # increment when adding new files
+    ['qpdf' => 74],             # increment when adding new files
     );
 
 my $n_tests = 0;