diff --git a/src/mariadb/types/character.rs b/src/mariadb/types/character.rs
index bdc55f6b..5c862506 100644
--- a/src/mariadb/types/character.rs
+++ b/src/mariadb/types/character.rs
@@ -37,7 +37,7 @@ impl ToSql<MariaDb> for &'_ str {
 impl ToSql<MariaDb> for String {
     #[inline]
     fn to_sql(self, buf: &mut Vec<u8>) -> IsNull {
-        self.as_str().to_sql(buf)
+        <&str as ToSql<MariaDb>>::to_sql(self.as_str(), buf)
     }
 }
 
diff --git a/src/mariadb/types/numeric.rs b/src/mariadb/types/numeric.rs
index bc0e2f4d..006359c8 100644
--- a/src/mariadb/types/numeric.rs
+++ b/src/mariadb/types/numeric.rs
@@ -102,14 +102,14 @@ impl HasSqlType<f32> for MariaDb {
 impl ToSql<MariaDb> for f32 {
     #[inline]
     fn to_sql(self, buf: &mut Vec<u8>) -> IsNull {
-        (self.to_bits() as i32).to_sql(buf)
+        <i32 as ToSql<MariaDb>>::to_sql((self.to_bits() as i32), buf)
     }
 }
 
 impl FromSql<MariaDb> for f32 {
     #[inline]
     fn from_sql(buf: Option<&[u8]>) -> Self {
-        f32::from_bits(i32::from_sql(buf) as u32)
+        f32::from_bits(<i32 as FromSql<MariaDb>>::from_sql(buf) as u32)
     }
 }
 
@@ -127,13 +127,13 @@ impl HasSqlType<f64> for MariaDb {
 impl ToSql<MariaDb> for f64 {
     #[inline]
     fn to_sql(self, buf: &mut Vec<u8>) -> IsNull {
-        (self.to_bits() as i64).to_sql(buf)
+        <i64 as ToSql<MariaDb>>::to_sql((self.to_bits() as i64), buf)
     }
 }
 
 impl FromSql<MariaDb> for f64 {
     #[inline]
     fn from_sql(buf: Option<&[u8]>) -> Self {
-        f64::from_bits(i64::from_sql(buf) as u64)
+        f64::from_bits(<i64 as FromSql<MariaDb>>::from_sql(buf) as u64)
     }
 }
diff --git a/src/postgres/types/character.rs b/src/postgres/types/character.rs
index 135d8e0a..2287b244 100644
--- a/src/postgres/types/character.rs
+++ b/src/postgres/types/character.rs
@@ -36,7 +36,7 @@ impl ToSql<Postgres> for &'_ str {
 impl ToSql<Postgres> for String {
     #[inline]
     fn to_sql(self, buf: &mut Vec<u8>) -> IsNull {
-        self.as_str().to_sql(buf)
+        <&str as ToSql<Postgres>>::to_sql(self.as_str(), buf)
     }
 }
 
diff --git a/src/postgres/types/numeric.rs b/src/postgres/types/numeric.rs
index b106649a..4fab71b5 100644
--- a/src/postgres/types/numeric.rs
+++ b/src/postgres/types/numeric.rs
@@ -101,14 +101,14 @@ impl HasSqlType<f32> for Postgres {
 impl ToSql<Postgres> for f32 {
     #[inline]
     fn to_sql(self, buf: &mut Vec<u8>) -> IsNull {
-        (self.to_bits() as i32).to_sql(buf)
+        <i32 as ToSql<Postgres>>::to_sql(self.to_bits() as i32, buf)
     }
 }
 
 impl FromSql<Postgres> for f32 {
     #[inline]
     fn from_sql(buf: Option<&[u8]>) -> Self {
-        f32::from_bits(i32::from_sql(buf) as u32)
+        f32::from_bits(<i32 as FromSql<Postgres>>::from_sql(buf) as u32)
     }
 }
 
@@ -126,13 +126,13 @@ impl HasSqlType<f64> for Postgres {
 impl ToSql<Postgres> for f64 {
     #[inline]
     fn to_sql(self, buf: &mut Vec<u8>) -> IsNull {
-        (self.to_bits() as i64).to_sql(buf)
+        <i64 as ToSql<Postgres>>::to_sql(self.to_bits() as i64, buf)
     }
 }
 
 impl FromSql<Postgres> for f64 {
     #[inline]
     fn from_sql(buf: Option<&[u8]>) -> Self {
-        f64::from_bits(i64::from_sql(buf) as u64)
+        f64::from_bits(<i64 as FromSql<Postgres>>::from_sql(buf) as u64)
     }
 }