diff --git a/extensions/inspector/build/src/Makefile.in b/extensions/inspector/build/src/Makefile.in
index 65ba35ecc310..a3253a3c4bc9 100644
--- a/extensions/inspector/build/src/Makefile.in
+++ b/extensions/inspector/build/src/Makefile.in
@@ -47,11 +47,12 @@ SHARED_LIBRARY_LIBS = \
 		$(NULL)
 
 EXTRA_DSO_LDOPTS += \
-    -L$(DIST)/bin \
-    -L$(DIST)/lib \
-    $(EXTRA_DSO_LIBS) \
-		$(MOZ_COMPONENT_LIBS) \
-		$(NULL)
+	-L$(DIST)/bin \
+	-L$(DIST)/lib \
+	$(EXTRA_DSO_LIBS) \
+	$(MOZ_COMPONENT_LIBS) \
+	$(PNG_LIBS) \
+	$(NULL)
 
 include $(topsrcdir)/config/rules.mk