diff --git a/compiler/rustc_incremental/src/persist/file_format.rs b/compiler/rustc_incremental/src/persist/file_format.rs
index 392c5bdc15a..68180a2214a 100644
--- a/compiler/rustc_incremental/src/persist/file_format.rs
+++ b/compiler/rustc_incremental/src/persist/file_format.rs
@@ -190,7 +190,7 @@ fn report_format_mismatch(report_incremental_info: bool, file: &Path, message: &
 
 fn rustc_version(nightly_build: bool) -> String {
     if nightly_build {
-        if let Some(val) = env::var_os("RUSTC_FORCE_INCR_COMP_ARTIFACT_HEADER") {
+        if let Some(val) = env::var_os("RUSTC_FORCE_RUSTC_VERSION") {
             return val.to_string_lossy().into_owned();
         }
     }
diff --git a/compiler/rustc_span/src/def_id.rs b/compiler/rustc_span/src/def_id.rs
index 0bba918994c..5390eed89fa 100644
--- a/compiler/rustc_span/src/def_id.rs
+++ b/compiler/rustc_span/src/def_id.rs
@@ -176,9 +176,9 @@ impl StableCrateId {
         // and no -Cmetadata, symbols from the same crate compiled with different versions of
         // rustc are named the same.
         //
-        // RUSTC_FORCE_INCR_COMP_ARTIFACT_HEADER is used to inject rustc version information
+        // RUSTC_FORCE_RUSTC_VERSION is used to inject rustc version information
         // during testing.
-        if let Some(val) = std::env::var_os("RUSTC_FORCE_INCR_COMP_ARTIFACT_HEADER") {
+        if let Some(val) = std::env::var_os("RUSTC_FORCE_RUSTC_VERSION") {
             hasher.write(val.to_string_lossy().into_owned().as_bytes())
         } else {
             hasher.write(option_env!("CFG_VERSION").unwrap_or("unknown version").as_bytes());
diff --git a/src/test/incremental/cache_file_headers.rs b/src/test/incremental/cache_file_headers.rs
index 7f1ef886ac8..9cf611c3379 100644
--- a/src/test/incremental/cache_file_headers.rs
+++ b/src/test/incremental/cache_file_headers.rs
@@ -7,7 +7,7 @@
 
 // The `l33t haxx0r` Rust compiler is known to produce incr. comp. artifacts
 // that are outrageously incompatible with just about anything, even itself:
-//[rpass1] rustc-env:RUSTC_FORCE_INCR_COMP_ARTIFACT_HEADER="l33t haxx0r rustc 2.1 LTS"
+//[rpass1] rustc-env:RUSTC_FORCE_RUSTC_VERSION="l33t haxx0r rustc 2.1 LTS"
 
 // revisions:rpass1 rpass2
 // compile-flags: -Z query-dep-graph
diff --git a/src/test/run-make-fulldeps/crate-hash-rustc-version/Makefile b/src/test/run-make-fulldeps/crate-hash-rustc-version/Makefile
index fd66702db7f..091508cd805 100644
--- a/src/test/run-make-fulldeps/crate-hash-rustc-version/Makefile
+++ b/src/test/run-make-fulldeps/crate-hash-rustc-version/Makefile
@@ -27,7 +27,7 @@ all:
 	$(RUSTC) b.rs --extern a=$(TMPDIR)/liba$(EXT) --crate-type=bin -Crpath $(FLAGS)
 	$(call RUN,b)
 	# Now re-compile a.rs with another rustc version
-	RUSTC_FORCE_INCR_COMP_ARTIFACT_HEADER=deadfeed $(RUSTC) a.rs --crate-type=dylib $(FLAGS)
+	RUSTC_FORCE_RUSTC_VERSION=deadfeed $(RUSTC) a.rs --crate-type=dylib $(FLAGS)
 	# After compiling with a different rustc version, write symbols to disk again.
 	$(NM_CMD) $(call DYLIB,a) > $(TMPDIR)/symbolsafter
 	# As a sanity check, test if the symbols changed: