diff --git a/rust/private/rustc.bzl b/rust/private/rustc.bzl
index 84175d2130..1e4cfdbc68 100644
--- a/rust/private/rustc.bzl
+++ b/rust/private/rustc.bzl
@@ -681,7 +681,7 @@ def construct_arguments(
     env["RULES_RUST_THIRD_PARTY_DIR"] = str(toolchain._third_party_dir).lower()
 
     # extra_rustc_flags apply to the target configuration, not the exec configuration.
-    if hasattr(ctx.attr, "_extra_rustc_flags") and is_exec_configuration(ctx):
+    if hasattr(ctx.attr, "_extra_rustc_flags") and not is_exec_configuration(ctx):
         rustc_flags.add_all(ctx.attr._extra_rustc_flags[ExtraRustcFlagsInfo].extra_rustc_flags)
 
     # Create a struct which keeps the arguments separate so each may be tuned or
diff --git a/rust/private/utils.bzl b/rust/private/utils.bzl
index 4f9079b2e3..14dab65299 100644
--- a/rust/private/utils.bzl
+++ b/rust/private/utils.bzl
@@ -368,7 +368,7 @@ def is_exec_configuration(ctx):
     """
 
     # TODO(djmarcin): Is there any better way to determine cfg=exec?
-    return ctx.genfiles_dir.path.find("-exec-") == -1
+    return ctx.genfiles_dir.path.find("-exec-") != -1
 
 def transform_deps(deps):
     """Conditionally transform a [Target] into [DepVariantInfo].