diff --git a/crates/spk-cli/common/src/flags.rs b/crates/spk-cli/common/src/flags.rs
index 5e775ed5d..abd0d7e42 100644
--- a/crates/spk-cli/common/src/flags.rs
+++ b/crates/spk-cli/common/src/flags.rs
@@ -1138,7 +1138,7 @@ pub struct DecisionFormatterSettings {
     /// Override the default solver output filename prefix. The
     /// current date, time, and solver kind name will be appended to
     /// this prefix to produce the file name for each solver.
-    #[clap(long, default_value_t=String::from(DEFAULT_SOLVER_RUN_FILE_PREFIX), env = SPK_OUTPUT_FILE_PREFIX)]
+    #[clap(long, default_value_t=String::from(DEFAULT_SOLVER_RUN_FILE_PREFIX), env = SPK_SOLVER_OUTPUT_FILE_PREFIX)]
     output_file_prefix: String,
 }