diff --git a/test/leak/sharp.supp b/test/leak/sharp.supp
index 3dd13965..d816984f 100644
--- a/test/leak/sharp.supp
+++ b/test/leak/sharp.supp
@@ -232,6 +232,14 @@
   fun:XML_ParseBuffer
   obj:*/libfontconfig.so.*
 }
+{
+  leak_fontconfig_XML_ParseBuffer_indirect
+  Memcheck:Leak
+  match-leak-kinds: indirect
+  ...
+  fun:XML_ParseBuffer
+  obj:*/libfontconfig.so.*
+}
 {
   leak_fontconfig_FcInitLoadConfigAndFonts
   Memcheck:Leak
@@ -242,6 +250,36 @@
   ...
   fun:FcInitLoadConfigAndFonts
 }
+{
+  leak_fontconfig_FcDefaultSubstitute
+  Memcheck:Leak
+  match-leak-kinds: indirect
+  fun:calloc
+  ...
+  fun:FcDefaultSubstitute
+  ...
+  fun:pango_itemize_with_base_dir
+  ...
+  fun:pango_layout_get_pixel_extents
+  fun:vips_text_get_extents
+}
+{
+  leak_fontconfig_FcLangSetCreate
+  Memcheck:Leak
+  match-leak-kinds: indirect
+  fun:malloc
+  fun:FcLangSetCreate
+  fun:FcLangSetCopy
+  fun:FcValueSave
+  ...
+  fun:FcFontRenderPrepare
+  fun:FcFontMatch
+  ...
+  fun:pango_itemize_with_base_dir
+  ...
+  fun:pango_layout_get_pixel_extents
+  fun:vips_text_get_extents
+}
 
 # heif
 {
diff --git a/test/unit/beforeEach.js b/test/unit/beforeEach.js
index 932cb8d7..9d055a0b 100644
--- a/test/unit/beforeEach.js
+++ b/test/unit/beforeEach.js
@@ -4,7 +4,7 @@ const detectLibc = require('detect-libc');
 const sharp = require('../../');
 
 const libcFamily = detectLibc.familySync();
-const usingCache = libcFamily !== detectLibc.MUSL;
+const usingCache = !(process.env.G_DEBUG || libcFamily === detectLibc.MUSL);
 const usingSimd = !(process.env.G_DEBUG || process.env.VIPS_NOVECTOR);
 const concurrency = process.env.VIPS_CONCURRENCY ||
   (libcFamily === detectLibc.MUSL || process.arch === 'arm' ? 1 : undefined);