diff --git a/src/commands/controlling_playback/seekcur.rs b/src/commands/controlling_playback/seekcur.rs
index 470f75a1..7ebc6fda 100644
--- a/src/commands/controlling_playback/seekcur.rs
+++ b/src/commands/controlling_playback/seekcur.rs
@@ -31,9 +31,8 @@ impl CommandRequest<'_> for SeekCurRequest {
     fn serialize(&self) -> String {
         let time_str = match self.mode {
             SeekMode::Absolute => format!("{}", self.time),
-            SeekMode::Relative if self.time >= 0.0 => format!("+{}", self.time),
-            SeekMode::Relative => format!("-{}", -self.time),
-            SeekMode::RelativeReverse => unimplemented!(), // TODO: should this happen?
+            SeekMode::Relative => format!("+{}", self.time),
+            SeekMode::RelativeReverse => format!("-{}", self.time),
         };
 
         format!("{} {}", Self::COMMAND, time_str)
@@ -45,6 +44,8 @@ impl CommandRequest<'_> for SeekCurRequest {
             None => return Err(RequestParserError::UnexpectedEOF),
         };
 
+        debug_assert!(parts.next().is_none());
+
         // TODO: DRY
         let (mode, time) = match time_raw {
             t if t.starts_with('+') => (
@@ -54,8 +55,8 @@ impl CommandRequest<'_> for SeekCurRequest {
                     .map_err(|_| RequestParserError::SyntaxError(0, t.to_owned()))?,
             ),
             t if t.starts_with('-') => (
-                SeekMode::Relative,
-                -t[1..]
+                SeekMode::RelativeReverse,
+                t[1..]
                     .parse::<TimeWithFractions>()
                     .map_err(|_| RequestParserError::SyntaxError(0, t.to_owned()))?,
             ),
@@ -66,7 +67,7 @@ impl CommandRequest<'_> for SeekCurRequest {
             ),
         };
 
-        debug_assert!(parts.next().is_none());
+        debug_assert!(time >= 0.0);
 
         Ok(SeekCurRequest { mode, time })
     }