diff --git a/test/check-utils b/test/check-utils
index 9161af2..5204329 100755
--- a/test/check-utils
+++ b/test/check-utils
@@ -53,6 +53,12 @@ checkutils()
             #check "$ZZOPTS" "-i cut -b1- < $file" "|cut -b1-"
             ;;
         esac
+        # Regression tests for stuff that used to break
+        check "$ZZOPTS" "$ZZCAT \"fread(1,33000) fseek(1,SEEK_SET) fread(1,1) fseek(4093,SEEK_CUR) fread(1,1) fseek(1,SEEK_CUR) fread(1,1)\" $file" \
+              "eglibc (2.9-21) bug regression"
+        check "$ZZOPTS" "$ZZCAT \"repeat(33000,getc_unlocked() ungetc() getline())\" $file" \
+              "sed getc_unlocked() bug regression"
+        # Misc tests
         for n in \
           "fread(1,33000)" \
           "repeat(33,fread(1,1000))" \
@@ -84,7 +90,6 @@ checkutils()
           "fread(1,33000) rewind() repeat(10000,fseek(4,SEEK_CUR) fread(1,4))" \
           "repeat(33000,getc() ungetc() getline())" \
           "repeat(33000,fgetc() ungetc() getline())" \
-          "repeat(33000,getc_unlocked() ungetc() getline())" \
           "fread(1,33000) fseek(1000,SEEK_CUR) repeat(10000,fread(1,2))" \
           "fread(1,33000) fseek(1000,SEEK_CUR) repeat(10000,getc())" \
           "fread(1,33000) fseek(1000,SEEK_CUR) repeat(10000,fgetc())" \