diff --git a/src/sql/mod.rs b/src/sql/mod.rs
index 6d2ea5e..f6dc724 100644
--- a/src/sql/mod.rs
+++ b/src/sql/mod.rs
@@ -21,6 +21,7 @@ pub(crate) enum SqlBuilder {
 pub(crate) enum Part {
     Arg,
     Fields,
+    Str(&'static str),
     Text(String),
 }
 
@@ -85,16 +86,12 @@ impl SqlBuilder {
         }
     }
 
-    pub(crate) fn append(&mut self, suffix: &str) {
+    pub(crate) fn append(&mut self, suffix: &'static str) {
         let Self::InProgress(parts) = self else {
             return;
         };
 
-        if let Some(Part::Text(text)) = parts.last_mut() {
-            text.push_str(suffix);
-        } else {
-            parts.push(Part::Text(suffix.to_string()));
-        }
+        parts.push(Part::Str(suffix));
     }
 
     pub(crate) fn finish(mut self) -> Result<String> {
@@ -103,6 +100,7 @@ impl SqlBuilder {
         if let Self::InProgress(parts) = &self {
             for part in parts {
                 match part {
+                    Part::Str(text) => sql.push_str(text),
                     Part::Text(text) => sql.push_str(text),
                     Part::Arg => {
                         self.error("unbound query argument");