diff --git a/compiler/comp_unit_interface.m b/compiler/comp_unit_interface.m
index 5d85d45c6..fb0558fde 100644
--- a/compiler/comp_unit_interface.m
+++ b/compiler/comp_unit_interface.m
@@ -621,7 +621,7 @@ generate_parse_tree_int0(ProgressStream, Globals, AddToHptm, BurdenedModule,
     else
         % The negative indent is to let the rest of the error_spec
         % start at the left margin.
-        PrefixPieces = [words("Error reading interface files."),
+        PrefixPieces = [words("Error reading .int3 and/or .int0 files."),
             nl_indent_delta(-1)],
         GenerateResult = gpti0_error(ModuleName, PrefixPieces, GetSpecs)
     ).
@@ -777,7 +777,7 @@ generate_parse_tree_int12(ProgressStream, Globals, AddToHptm,
     else
         % The negative indent is to let the rest of the error_spec
         % start at the left margin.
-        PrefixPieces = [words("Error reading .int3 files."),
+        PrefixPieces = [words("Error reading .int3 and/or .int0 files."),
             nl_indent_delta(-1)],
         GenerateResult = gpti12_error(ModuleName, PrefixPieces, GetSpecs)
     ).
diff --git a/tests/invalid_make_int/missing_parent_import.int_err_exp b/tests/invalid_make_int/missing_parent_import.int_err_exp
index 230471dd2..700d5df3b 100644
--- a/tests/invalid_make_int/missing_parent_import.int_err_exp
+++ b/tests/invalid_make_int/missing_parent_import.int_err_exp
@@ -6,5 +6,5 @@ missing_parent_import.m:028:   to the `:- import_module' and `:- use_module'
 missing_parent_import.m:028:   declarations for its child modules
 missing_parent_import.m:028:   `missing_parent_import_helper_1.child' and
 missing_parent_import.m:028:   `missing_parent_import_helper_1.child2'.
-Error reading .int3 files.
+Error reading .int3 and/or .int0 files.
 `missing_parent_import.int' and `missing_parent_import.int2' not written.
diff --git a/tests/invalid_make_int/sub_c.int_err_exp b/tests/invalid_make_int/sub_c.int_err_exp
index b3ac1fabd..7bb366200 100644
--- a/tests/invalid_make_int/sub_c.int_err_exp
+++ b/tests/invalid_make_int/sub_c.int_err_exp
@@ -3,5 +3,5 @@ sub_c.m:015:   the absence of an `:- import_module' or `:- use_module'
 sub_c.m:015:   declaration for `sub_c_helper_1' prevents access to the
 sub_c.m:015:   `:- import_module' declaration for its child module
 sub_c.m:015:   `sub_c_helper_1.sub1'.
-Error reading .int3 files.
+Error reading .int3 and/or .int0 files.
 `sub_c.int' and `sub_c.int2' not written.
diff --git a/tests/invalid_make_int/test_nested.int_err_exp b/tests/invalid_make_int/test_nested.int_err_exp
index ea850acdb..8f6199e2a 100644
--- a/tests/invalid_make_int/test_nested.int_err_exp
+++ b/tests/invalid_make_int/test_nested.int_err_exp
@@ -7,5 +7,5 @@ test_nested.m:017:   the absence of an `:- import_module' or `:- use_module'
 test_nested.m:017:   declaration for `test_nested_helper_2' prevents access to
 test_nested.m:017:   the `:- use_module' declaration for its child module
 test_nested.m:017:   `test_nested_helper_2.test_nested_helper_6'.
-Error reading .int3 files.
+Error reading .int3 and/or .int0 files.
 `test_nested.int' and `test_nested.int2' not written.